Abstract
This paper is a survey of recent results in the geometry of 6-dimensional Hermitian manifolds of Cayley algebras. We describe Gray–Hervella classes of almost Hermitian structures on 6-dimensional oriented submanifolds of Cayley algebras and propose a characterization of these in terms of the Kirichenko tensors and the configuration tensor.
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A. Abu-Saleem, “Some remarks on almost Hermitian manifolds with J-invariant Ricci tensor,” Int. Math. Forum, 5, No. 2 (2010).
A. Abu-Saleem and M. Banaru, “Some applications of Kirichenko tensors,” An. Univ. Oradea, Fasc. Mat., 17, No. 2, 201–208 (2010).
O. E. Arsen’eva and V. F. Kirichenko, “Self-dual geometry of generalized Hermitian surfaces,” Mat. Sb., 189, No. 1, 21–44 (1998).
M. B. Banaru, A new characterization of the classes of almost Hermitian Gray–Hervella structures [in Russian], preprint, Smolensk. State Pedagogical Institute (1992). Deposited at the All-Russian Institute for Scientific and Technical Information (VINITI), Moscow, No. 3334-B92.
M. B. Banaru, “Gray–Hervella classes of almost Hermitian structures on 6-dimensional submanifolds of Cayley algebras,” in: Proc. Int. Mat. Conf. Dedicated to the 200th Anniversary of N. I. Lobachevskii, Akad. Nauk Resp. Belarus’, 1, Minsk (1993), p. 40.
M. B. Banaru, On the Gray–Hervella classification of almost Hermitian structures on 6-dimensional submanifolds of Cayley algebras [in Russian], Smolensk. State Pedagogical Institute (1993). Deposited at the All-Russian Institute for Scientific and Technical Information (VINITI), Moscow, No. 118-B93.
M. B. Banaru, On almost Hermitian structures induced by 3-vector products on 6-dimensional submanifolds of Cayley algebras [in Russian], Smolensk. State Pedagogical Institute (1993). Deposited at the All-Russian Institute for Scientific and Technical Information (VINITI), Moscow, No. 1282-B93.
M. B. Banaru, “On the minimality of almost Hermitian 6-dimensional submanifolds of Cayley algebras,” in Proc. Int. Sci. Conf. “Pontryagin Readings–IV,” Voronezh (1993), p. 17.
M. B. Banaru, “On the para-Kählerian property of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Differential Geometry of Manifolds of Figures [in Russian], 25, Kaliningrad State Univ., Kaliningrad (1994), pp. 15–18.
M. B. Banaru, “On the para-Kählerian property of six-dimensional Hermitian submanifolds of Cayley algebras,” in: Webs and Quasigroups [in Russian], Kalinin, (1994), pp. 81–83.
M. B. Banaru, “Gray–Hervella classes of almost Hermitian structures on 6-dimensional submanifolds of Cayley algebras,” in: Proc. Moscow State Pedagogical Univ., Moscow (1994), pp. 36–38.
M. B. Banaru, “On the holomorphic bisectional curvature of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Differential Geometry of Manifolds of Figures [in Russian], 28, Kaliningrad State Univ., Kaliningrad (1997), pp. 7–9.
M. B. Banaru, “On almost Hermitian structures induced by 3-vector products on 6-dimensional submanifolds of the octave algebra,” in: Polyanalytic Functions: Boundary Properties and Boundary-Value Problems [in Russian], Smolensk (1997), pp. 113–117.
M. B. Banaru, “On the properties of the curvature of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Proc. Int. Semin. “Selected Questions of Higher Mathematics and Informatics”, Smolensk (1997), pp. 25–26.
M. B. Banaru, “On spectra of the most important tensors of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: The Newest Problems of the Field Theory [in Russian], Kazan’ (2000), pp. 18–22.
M. B. Banaru, “On 6-dimensional submanifolds of Cayley algebras,” in: Differential Geometry of Manifolds of Figures [in Russian], 31, Kaliningrad State Univ., Kaliningrad (2000), pp. 6–8.
M. B. Banaru, “On 6-dimensional G 1-submanifolds of the octave algebra,” in: Proc. Moscow State Pedagogical Univ., Moscow (2000), pp. 165–171.
M. B. Banaru, “A note on six-dimensional Vaisman–Gray submanifolds of Cayley algebras,” in: Webs and Quasigroups [in Russian], Tver (2000), pp. 139–142.
M. B. Banaru, “A note on six-dimensional Hermitian submanifolds of Cayley algebras,” Bul. S¸tiint¸. Univ. Politeh. Timi¸s., 45(59), No. 2, 17–20 (2000).
M. B. Banaru, “Six theorems on six-dimensional Hermitian submanifolds of Cayley algebras,” Izv. Akad. Nauk Resp. Moldova. Ser. Mat., 3 (34), 3–10 (2000).
M. B. Banaru, “On six-dimensional Hermitian submanifolds of Cayley algebras satisfying the g-cosymplectic hypersurfaces axiom,” Ann. Univ. Sofia Fac. Math. Inform., 94, 91–96 (2000).
M. B. Banaru, “On 6-dimensional W 4-submanifolds of the octave algebra,” in: Proc. Moscow State Pedagogical Univ., Moscow (2001), pp. 46–48.
M. B. Banaru, “A new example of an R 2-manifold,” in: Proc. VIII Int. Sci. Conf. “Mathematics. Computer. Education,” Moscow (2001), p. 125.
M. B. Banaru, “On conformally flat c-para-Kählerian manifolds,” in: Proc. IX Int. Conf. “Mathematica. Education. Economics. Ecology,” Cheboksary (2001), p. 35.
M. B. Banaru, “On R 2- and cR 2-manifolds,” in: Mathematics. Computer. Education [in Russian], 8, Moscow (2001), pp. 471–476.
M. B. Banaru, “On locally Euclidean para-Kählerian manifolds,” in: Proc. Ukrain. Math. Congr., Kiev (2001), pp. 13–14.
M. B. Banaru, “On AH-manifolds with J-invariant Ricci tensor,” in: Proc. IV Int. Conf. on Geometry and Topology, Cherkassy (2001), p. 9.
M. B. Banaru, “On para-Kählerian and c-para-Kählerian manifolds,” in: Differential Geometry of Manifolds of Figures [in Russian], 32, Kaliningrad State Univ., Kaliningrad (2001), pp. 8–13.
M. B. Banaru, “On the geometry of cosymplectic hyperplanes of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Proc. Int. Sci. Conf. “Volga-2001” (Petrovskii Readings), Kazan’ (2001), p. 25.
M. B. Banaru, “On the Einstein property of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Studies in the Boundary-Value Problems of Complex Analysis and Differential Equations [in Russian], 3, Smolensk (2001), pp. 28–35.
M. B. Banaru, “On the geometry of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Invariant Methods of the Study of Structures on Manifolds in Geometry, Analysis, and Mathematical Physics [in Russian] (L. E. Evtushik and A. K. Rybnikov, eds.), 1, Moscow (2001), pp. 16–20.
M. B. Banaru, “On six-dimensional Hermitian submanifolds of Cayley algebras,” Stud. Univ. Babeş-Bolyai. Math., 46, No. 1, 11–14 (2001).
M. B. Banaru, “Two theorems on cosymplectic hypersurfaces of six-dimensional Hermitian submanifolds of Cayley algebras,” J. Harbin Inst. Tech., 8, No. 1, 38–40 (2001).
M. B. Banaru, “A note on Kirichenko tensors,” in: Proc. Int. Sci. Conf. “Volga-2001” (Petrovskii Readings), Kazan’ (2001), p. 26.
M. B. Banaru, “A new characterization of the Gray—Hervella classes of almost Hermitian manifolds,” in: Proc. 8th Int. Conf. on Differential Geometry and Its Aplications, Opava, Czech Republic (2001), p. 4.
M. B. Banaru, “A note on RK- and CRK-manifolds,” Izv. Akad. Nauk Resp. Moldova. Ser. Mat., 1 (35), 37–43 (2001).
M. B. Banaru, “On six-dimensional G1-submanifolds of Cayley algebras,” Acta Univ. Palack. Olomuc. Fac. Rerum Natur. Math., 40, 17–21 (2001).
M. B. Banaru, “On the holomorphic bisectional curvature of six-dimensional Hermitian submanifolds of Cayley algebras,” Bull. Transilv. Univ. Braşov., 8 (43), 19–23 (2001).
M. B. Banaru, “Two theorems on cosymplectic hypersurfaces of six-dimensional Kählerian submanifolds of Cayley algebras,” Bul. Ştiint¸. Univ. Politeh. Timiş., 46, No. 2, 13–17 (2001).
M. B. Banaru, “A note on almost Hermitian manifolds with a J-invariant Ricci tensor,” Izv. Akad. Nauk Resp. Moldova. Ser. Mat., 3 (37), 88–92 (2001).
M. B. Banaru, “Some theorems on cosymplectic hypersurfaces of six-dimensional Hermitian submanifolds of Cayley algebras,” Mat. Vesn. (Bull. Math. Soc. Serbia), 53, Nos. 3-4, 103–110 (2001).
M. B. Banaru, “A note on six-dimensional G 2-submanifolds of Cayley algebras,” An. Ştiint¸. Univ. Al. I. Cuza. Iaşi. Mat., 47, No. 2, 389–396 (2001).
M. B. Banaru, “On the typical number of symmetric 6-dimensional Hermitian submanifolds of Cayley algebras,” Proc. IX Int. Sci. Conf. “Mathematics. Computer. Education,”, Moscow (2002), pp. 118.
M. B. Banaru, “On W 3-manifolds satisfying the axiom of G-cosymplectic hypersurfaces,” Proc. XXIV Conf. Young Scientists, Moscow State Univ., Moscow (2002), pp. 15–19.
M. B. Banaru, “Two theorems on cosymplectic hypersurfaces of 6-dimensional Hermitian submanifolds of Cayley algebras,” Izv. Vyssh. Uchebn. Zaved. Ser. Mat., 1 (476), 9–12 (2002).
M. B. Banaru, “On the typical number of planar 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Problems of Theor. Cybernetics. Proc. XIII Int. Conf. (O. B. Lupanov, ed.), 1, Moscow (2002), pp. 19.
M. B. Banaru, “Hermitian geometry of 6-dimensional submanifolds of Cayley algebras,” Mat. Sb., 193, No. 5, 3–16 (2002).
M. B. Banaru, “On the semi-Kählerian property of 6-dimensional almost Hermitian submanifolds of the octave algebra,” Proc. Int. Sci. Conf. “Volga-2002” (Petrovskii Reaings), Kazan’ (2002), pp. 15.
M. B. Banaru, “On spectra of some tensors of six-dimensional Kählerian submanifolds of Cayley algebras,” Stud. Univ. Babeş-Bolyai. Math., 47, No. 1, 11–17 (2002).
M. B. Banaru, “On Kenmotsu hypersurfaces in a six-dimensional Hermitian submanifolds of Cayley algebras,” in: Proc. Int. Conf. “Contemporary Geometry and Related Topics,” Beograd (2002), p. 5.
M. B. Banaru, “A note on R 2- and CR 2-manifolds,” J. Harbin Inst. Tech., 9, No. 2, 136–138 (2002).
M. B. Banaru, “A note on six-dimensional G1-submanifolds of the octave algebra,” Taiwanese J. Math., 6, No. 3, 383–388 (2002).
M. B. Banaru, “Six-dimensional Hermitian submanifolds of Cayley algebras and u-Sasakian hypersurfaces axiom,” Izv. Akad. Nauk Resp. Moldova. Ser. Mat., 2 (39), 71–76 (2002).
M. B. Banaru, “On totally umbilical cosymplectic hypersurfaces of six-dimensional Hermitian submanifolds of Cayley algebras,” Acta Univ. Palack. Olomuc. Fac. Rerum Natur. Math., 41, 7–12 (2002).
M. B. Banaru, “Some remarks on para-Kählerian and C-para-Kählerian manifolds,” Bull. Transilv. Univ. Braşov., 9 (44), 11–18 (2002).
M. B. Banaru, “On the type number of six-dimensional planar Hermitian submanifolds of Cayley algebras,” Kyungpook Math. J., 43, No. 1, 27–35 (2003).
M. B. Banaru, “A note on para-Kählerian manifolds,” Kyungpook Math. J., 43, No. 1, 49–61 (2003).
M. B. Banaru, “A note on Kirichenko tensors,” in: The Newest Problems of the Field Theory [in Russian], Kazan’ (2003), pp. 56–62.
M. B. Banaru, “On cosymplectic hypersurfaces of 6-dimensional Kählerian submanifolds of Cayley algebras,” Izv. Vyssh. Uchebn. Zaved. Ser. Mat., 7 (494), 59–63 (2003).
M. B. Banaru, “On the geometry of cosymplectic hypersurfaces of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: The Newest Problems of the Field Theory [in Russian], Kazan’ (2003), pp. 38–43.
M. B. Banaru, “On the eight Gray–Hervella classes of almost Hermitian structures realized on 6-dimensional submanifolds of Cayley algebras,” The Newest Problems of the Field Theory [in Russian], Kazan’ (2003), pp. 44–50.
M. B. Banaru, “On 6-dimensional G 2-submanifolds of Cayley algebras,” Mat. Zametki, 74, No. 3, 323–328 (2003).
M. B. Banaru, “On an hypersurfaces of 6-dimensional Hermitian submanifolds of Cayley algebras,” Mat. Sb., 194, No. 8, 13–24 (2003).
M. B. Banaru, “On the typical number of cosymplectic hypersurfaces of 6-dimensional Hermitian submanifolds of Cayley algebras,” Sib. Mat. Zh., 44, No. 5, 981–991 (2003).
M. B. Banaru, “On Kenmotsu hypersurfaces of 6-dimensional Hermitian submanifolds of Cayley algebras,” in: Differential Geometry of Manifolds of Figures [in Russian], 34, Kaliningrad State Univ., Kaliningrad (2003), pp. 12–21.
M. B. Banaru, “On Kenmotsu hypersurfaces in a six-dimensional Hermitian submanifold of Cayley algebras,” Proc. of the Workshop “Contemporary Geometry and Related Topics,” Belgrade, Yugoslavia May 15–21, 2002, World Scientific, Singapore (2004), pp. 33–40.
M. B. Banaru, “On the Gray–Hervella classes of AH-structures on six-dimensional submanifolds of Cayley algebras,” Ann. Univ. Sofia Fac. Math. Inform., 95, 125–131 (2004).
M. B. Banaru, “On some almost contact metric hypersurfaces in six-dimensional special Hermitian submanifolds of Cayley algebras,” Proc. Int. Conf. “Selected Questions of Contemporary Mathematics” Dedicated to the 200th Anniversary of C. Jacobi, Kaliningrad (2005), pp. 6.
M. B. Banaru, “New results of the geometry of almost Kählerian manifolds,” in: Proc. XV Military-Scientific Conf., 4, Smolensk (2007), pp. 88–90.
M. Banaru and G. Banaru, “On six-dimensional planar Hermitian submanifolds of Cayley algebras,” Bul. Ştiint¸. Univ. Politeh. Timiş., 46 (60), No. 1, 13–17 (2001).
M. B. Banaru and V. F. Kirichenko, “Hermitian geometry of 6-dimensional submanifolds of Cayley algebras,” Usp. Mat. Nauk, 49, No. 1, 205–206 (1994).
F. Belgun and A. Moroianu, “Nearly Kähler 6-manifolds with reduced holonomy,” Ann. Global Anal. Geom., 19, 307–319 (2001).
A. L. Besse, Einstein Manifolds, Springer-Verlag, Berlin (1987).
R. Brown and A. Gray, “Vector cross products,” Comment. Math. Helv., 42, 222–236 (1967).
R. L. Bryant, “Submanifolds and special structures on the octonions,” J. Differ. Geom., 17, 185–232 (1982).
E. Calabi, “Construction and properties of some 6-dimensional almost complex manifolds,” Trans. Am. Math. Soc., 87, No. 2, 407–438 (1958).
´E. Cartan, Le¸cons sur la g´eom´etrie des espaces de Riemann, Gauthiers-Villars (1928).
X. Chen, “Recent progress in Kähler geometry,” in: Proc. Int. Congr. Mat. 2002, 2, 273–282 (2002).
J. T. Cho and K. Sekigawa, “Six-dimensional quasi-Kählerian manifolds of constant sectional curvature,” Tsukuba J. Math., 22, No. 3, 611–627 (1998).
T. Choi and Z. Lu, “On the DDVV conjecture and comass in calibrated geometry, I,” Math. Z., 260, 409–429 (2008).
V. Cortes, “Special Kaehler manifolds: a survey,” Rend. Circ. Mat. Palermo, 69, 11–18 (2002).
R. Deszcz, F. Dillen, L. Verstraelen, and L. Vrancken, “Quasi-Einstein totally real submanifolds of nearly Kähler 6-sphere,” Tôhoku Math. J., 51, 461–478 (1999).
T. C. Draghici, “On some 4-dimensional almost Kähler manifolds,” Kodai Math. J., 18, 156–163 (1995).
T. C. Draghici, “Almost Kähler 4-manifolds with J-invariant Ricci tensor,” Houston J. Math., 25, 133–145 (1999).
S. Dragomir and L. Ornea, Locally Conformal Kähler Geometry, Progr. Math., Birkhäuser, Boston (1998).
B. A. Dubrovin, S. P. Novikov, and A. T. Fomenko, Contemporary Geometry. Methods and Applications [in Russian], Nauka, Moscow (1986).
B. Eckmann, “Stetige losungen linearer gleichungsysteme,” Comment. Math. Helv., 15, 318–339 (1942-1943).
N. Ejiri, “Totally real submanifolds in a 6-sphere,” Proc. Am. Math. Soc., 83, 759–763 (1981).
H. Freudenthal, Oktaven, Ausnahmegruppen und Oktavengeometrie, Mathematisch Instituut der Rijksuniversiteit te Utrecht (1951).
S. Funabashi and J. S. Pak, “Tubular hypersurfaces of the nearly Kähler 6-sphere,” Saitama Math. J., 19, 13–36 (2001).
G. Ganchev and O. Kassabov, “Hermitian manifolds of pointwise constant antiholomorphic sectional curvatures,” Serdica Math. J., 33, 377–386 (2007).
G. Gheorghiev and V. Oproiu, Varietati diferentiabile finit si infinit dimensionale, Bucuresti Acad. RSR (1976–1979).
S. Goldberg and S. Kobayashi, “Holomorphic bisectional curvature,” J. Differ. Geom., 1, 225–233 (1967).
A. Gray, “Minimal varieties and almost Hermitian submanifolds,” Michigan Math. J., 12, 273–287 (1965).
A. Gray, “Some examples of almost Hermitian manifolds,” Ill. J. Math., 10, No. 2, 353–366 (1966).
A. Gray, “Six-dimensional almost complex manifolds defined by means of three-fold vector cross products,” Tôhoku Math. J., 21, No. 4, 614–620 (1969).
A. Gray, “Vector cross products on manifolds,” Trans. Am. Math. Soc., 141, 465–504 (1969).
A. Gray, “Almost complex submanifolds of the six sphere,” Proc. Am. Math. Soc., 20, 277–280 (1969).
A. Gray, “Nearly Kähler manifolds,” J. Differ. Geom., 4, 283–309 (1970).
A. Gray, “The structure of nearly Kähler manifolds,” Math. Ann., 223, 223–248 (1976).
A. Gray, “Curvature identities for Hermitian and almost Hermitian manifolds,” Tôhoku Math. J., 28, No. 4, 601–612 (1976).
A. Gray and L. M. Hervella, “The sixteen classes of almost Hermitian manifolds and their linear invariants,” Ann. Mat. Pura Appl., 123, No. 4, 35–58 (1980).
H. Hashimoto, “Characteristic classes of oriented 6-dimensional submanifolds in the octonions,” Kodai Math. J., 16, 65–73 (1993).
H. Hashimoto, “Oriented 6-dimensional submanifolds in the octonions,” Int. J. Math. Math. Sci., 18, 111–120 (1995).
H. Hashimoto, T. Koda, K. Mashimo, and K. Sekigawa, “Extrinsic homogeneous Hermitian 6-dimensional submanifolds in the octonions,” Kodai Math. J., 30, 297–321 (2007).
S. Helgason, Differential Geometry, Lie Groups, and Symmetric Spaces, Pure Appl. Math., 80, Academic Press, New York–San Francisco–London (1978).
L. Hernandez-Lamoneda, “Curvature vs almost Hermitian structures,” Geom. Dedic., 79, 205–218 (2000).
L. M. Hervella and E. Vidal, “Novelles gèomètries pseudo-kahlèriennes G 1 et G 2,” C. R. Acad. Sci. Paris. Ser. 1, 283, 115–118 (1976).
C. C. Hsiung, Almost Complex and Complex Structures, World Scientific, Singapore (1995).
N. E. Hurt, Geometric Quantization in Action. Applications of Harmonic Analysis in Quantum Statistical Mechanics and Quantum Field Theory, Math. Appl., 8, Reidel Publ., Dordrecht–Boston–London (1983).
S. Ianus, “Submanifolds of almost Hermitian manifolds,” Riv. Mat. Univ. Parma, 3, 123–142 (1994).
S. Ianus, Geometrie Diferentiala cu Aplicatii in Teoria Relativitatii, Editura Academiei Romane, Bucure,sti (1983).
J. Jost, Riemannian Geometry and Geometric Analysis, Springer-Verlag, Berlin–Heidelberg–New York (2003).
T. Kashiwada, “On a class of locally conformal Kähler manifolds,” Tensor (N.S.), 63, 297–306 (2002).
H. S. Kim and R. Takagi, “The type number of real hypersurfaces in P n (C),” Tsukuba J. Math., 20, 349–356 (1996).
Un Kyu Kim, “On six-dimensional almost Hermitian manifolds with pointwise constant holomorphic sectional curvature,” Nihonkai Math. J., 6, 185–200 (1995).
V. F. Kirichenko, “Almost Kählerian structures induced by 3-vector products on 6-dimensional submanifolds of Cayley algebras,” Vestn. MGU. Ser. Mat. Mekh., 3, 70–75 (1973).
V. F. Kirichenko, “K-spaces of the constant type,” Sib. Mat. Zh., 17, No. 2, 282–289 (1976).
V. F. Kirichenko, “Classification of Kählerian structures induced by 3-vector products on 6-dimensional submanifolds of Cayley algebras,” Izv. Vyssh. Uchebn. Zaved. Ser. Mat., 8, 32–38 (1980).
V. F. Kirichenko, “Stability of almost Hermitian structures induced by 3-vector products on 6-dimensional submanifolds of Cayley algebras,” Ukr. Geom. Sb., 25, 60–68 (1982).
V. F. Kirichenko, “The tangent bundle from the point of view of generalized Hermitian geometry,” Izv. Vyssh. Uchebn. Zaved. Ser. Mat., 6, 50–58 (1984).
V. F. Kirichenko, “Methods of generalized Hermitian geometry in the theory of almost contact manifolds,” in: Itogi Nauki Tekhn. Probl. Geom., 18, All-Russian Institute for Scientific and Technical Information (VINITI), Moscow (1986), pp. 25–71.
V. F. Kirichenko, “Locally conformal Kählerian manifolds of a constant holomorphic sectional curvature,” Mat. Sb., 182, No. 3, 354–362 (1991).
V. F. Kirichenko, “Hermitian geometry of 6-dimensional symmetric submanifolds of Cayley algebras,” Vestn. MGU. Ser. Mat. Mekh., 1, 6–13 (1994).
V. F. Kirichenko, Differential-Geometric Structures on Manifolds [in Russian], Moscow (2003).
V. F. Kirichenko, “Generalized Gray–Hervella classes and holomorphically-projective trnsformations of almost Hermitian structures,” Izv. Ross. Akad. Nauk. Ser. Mat., 69, No. 5, 107–132 (2005).
V. F. Kirichenko and N. A. Ezhova, “Conformal invariants of Vaisman–Gray manifolds,” Usp. Mat. Nauk, 51, No. 2, 163–164 (1996).
V. F. Kirichenko and N. N. Shchipkova, “On the geometry of Vaisman–Gray manifolds,” Usp. Mat. Nauk, 49, No. 2, 155–156 (1994).
V. F. Kirichenko and L. I. Vlasova, “Concircular geometry of approximately Kählerian manifolds,” Mat. Sb., 193, No. 5, 51–76 (2002).
S. Kobayashi and K. Nomizu, Foundations of Differential Geometry, Vol. 1, Interscience Publ. New York–London (1963).
S. Kobayashi and K. Nomizu, Foundations of Differential Geometry, Vol. 2, Interscience Publ. New York–London (1969).
M. Kon and K. Yano, Structures on Manifolds, Pure Math., 3, World Scientific (1984).
H. Kurihara, “On real hypersurfaces in a complex space form,” Math. J. Okayama Univ., 40, 177–186 (1998).
H. Kurihara, “The type number on real hypersurfaces in a quaternionic space form,” Tsukuba J. Math., 24, 127–132 (2000).
H. Kurihara and R. Takagi, “A note on the type number of real hypersurfaces in P n (C),” Tsukuba J. Math., 22, 793–802 (1998).
G. F. Laptev, “Fundamental higher-orders infinitesimal structures on smooth manifolds,” in: Tr. Geom. Semin., 1, All-Union Institute for Scientific and Technical Information (VINITI), Moscow (1966), pp. 139–189.
J. J. Levko, “Some characterizations of Kählerian structure,” Tensor (N.S.), 41, 249–257 (1984).
J. J. Levko, “Almost semi-Kählerian structure,” Tensor (N.S.), 64, 295–296 (2003).
H. Li, “The Ricci curvature of totally real 3-dimensional submanifolds of the nearly Kaehler 6-sphere,” Bull. Belg. Math. Soc. Simon Stevin., 3, 193–199 (1996).
H. Li and G. Wei, “Classification of Lagrangian Willmore submanifolds of the nearly Kaehler 6-sphere S 61 with constant scalar curvature,” Glasgow Math. J., 48, 53–64 (2006).
A. Lichnerowicz, Th´orie globale des connexions et des groupes d’holonomie, Rome, Edizioni Cremonese (1955).
D. Luczyszyn, “On para-Kählerian manifolds with recurrent paraholomorphic projective curvature,” Math. Balkanica (N.S.), 14, 167–176 (2000).
D. Luczyszyn, “On Bochner semisymmetric para-Kählerian manifolds,” Demonstr. Math., 4, 933–942 (2001).
D. Luczyszyn, “On pseudosymmetric para-Kählerian manifolds,” Beiträge Algebra Geom., 44, No. 2, 551–558 (2003).
G. Mari, “Curvature identities for an almost C-manifold,” Stud. Cerc. Mat., 50, Nos. 1-2, 23–38 (1998).
M. Matsumoto, “On 6-dimensional almost Tachibana spaces,” Tensor (N.S.), 23, 250–252 (1972).
P. Matzeu and M.-I. Munteanu, “Vector cross products and almost contact structures,” Rend. Mat. Roma, 22, 359–376 (2002).
A. S. Mishchenko and A. T. Fomenko, A Course in Differential Geometry and Topology [in Russian], Moscow (1980).
R. S. Mishra, “Normality of the hypersurfaces of almost Hermite manifolds,” J. Indian Math. Soc., 61, 71–79 (1995).
M. I. Munteanu, “Doubly warped products CR-submanifolds in locally conformal Kaehler manifolds,” Monatsh. Math., 150, No. 4, 333–342 (2007).
P.-A. Nagy, “On nearly-Kähler geometry,” Ann. Global Anal. Geom., 22, 167–178 (2002).
H. Nakagawa and R. Takagi, “On locally symmetric Kaehler submanifolds in a complex projective space,” J. Math. Soc. Jpn., 28, 638–667 (1976).
A. Nannicini, “On certain Kähler submanifolds of twistor spaces,” Boll. Unione Mat. Ital. Sez. B, 11, 257–265 (1997).
A. P. Norden, Theory of Surfaces [in Russian], Moscow (1956).
V. Oproiu, “Some classes of natural almost Hermitian structures on the tangent bundles,” Publ. Math. Debrecen., 62, Nos. 3–4, 561–576 (2003).
V. Oproiu, “Some classes of general natural almost Hermitian structures on tangent bundles,” Rev. Roum. Math. Pures Appl., 48, Nos. 5–6, 521–533 (2003).
M. Panak and J. Vanzura, “Three-forms and almost complex structures on six-dimensional manifolds,” J. Austr. Math. Soc., 84, 247–263 (2008).
V. I. Pan’zhenskii and K. B. Shiryaev, “Tensor signs of classes of almost Hermitian structures on the tangent bundle,” in: Motions in Generalized Spaces [in Russian], Penza (1999), pp. 126–132.
A. Z. Petrov, Einstein Spaces [in Russian], Moscow (1961).
M. M. Postnikov, Lectures in Geometry. Semester IV. Differential Geometry [in Russian], Nauka, Moscow (1988).
P. K. Rashevskii, Riemannian Geometry and Tensor Analysis [in Russian], Nauka, Moscow (1967).
G. B. Rizza, “Varieta parakähleriane,” Ann. Mat. Pura Appl., 98, 47–61 (1974).
P. J. Ryan, “Kähler manifolds as real hypersurfaces,” Duke Math. J., 40, 207–213 (1973).
T. Sato, “An example of an almost Kähler manifold with pointwise constant holomorphic sectional curvature,” Tokyo J. Math., 23, No. 2, 387–401 (2000).
S. Sawaki and K. Sekigawa, “Almost Hermitian manifolds with constant holomorphic sectional curvature,” J. Differ. Geom., 9, 123–134 (1974).
K. Sekigawa, “Almost Hermitian manifolds satisfying some curvature conditions,” Kodai Math. J., 2, 384–405 (1979).
K. Sekigawa, “Almost complex submanifolds of a six-dimensional sphere,” Kodai Math. J., 6, 174–185 (1983).
K. Sekigawa, “On some compact Einstein almost Kähler manifolds,” J. Math. Soc. Jpn., 36, 677–684 (1987).
K. Sekigawa, “On some 4-dimensional compact almost Hermitian manifolds,” J. Ramanujan Math. Soc., 2, 101–116 (1987).
S. S. Shern, M. P. Do Carmo, and S. Kobayashi, “Minimal submanifolds of a sphere with second fundamental form of constant length,” in: Functional Analysis and Related Fields, Springer- Verlag, Berlin (1970), pp. 59–75.
R. Takagi, “A class of hypersurfaces with constant principal curvatures in a sphere,” J. Differ. Geom., 11, 225–233 (1976).
Z. Tang, “Curvature and integrability of an almost Hermitian structure,” Int. J. Math., 27, No. 1, 97–105 (2006).
S. Tanno, “Constancy of holomorphic sectional curvature in almost Hermitian manifolds,” Kodai Math. Semin. Repts., 25, 190–201 (1973).
S. Tanno, “Ricci curvature of contact Riemannian manifolds,” Tôhoku Math. J., 40, 441–448 (1988).
M. Tekkoyun, “A general view to classification of almost Hermitian manifolds,” Rend. Inst. Mat. Univ. Trieste, 38, 1–15 (2006).
F. Tricerri, “Some examples of locally conformal Kähler manifolds,” Rend. Sem. Mat. Univ. Politec. Torino, 40, 81–92 (1982).
F. Tricerri and L. Vanhecke, “Curvature tensors on almost Hermitian manifolds,” Trans. Am. Math. Soc., 267, 365–398 (1981).
I. Vaisman, “On locally conformal almost Kähler manifolds,” Israel J. Math., 24, 338–351 (1976).
I. Vaisman, “On locally and globally conformal Kähler manifolds,” Trans. Am. Math. Soc., 2, 533–542 (1980).
L. Vanhecke, “Almost Hermitian manifolds with J-invariant Riemann curvature tensor,” Rend. Sem. Mat. Univ. Politec. Torino, 34, 487–498 (1975–1977).
L. Vanhecke, “The Bochner curvature tensor on almost Hermitian manifolds,” Geom. Dedic., 6, 389–397 (1977).
L. Vrancken, “Special Lagrangian submanifolds of the nearly Kaehler 6-sphere,” Glasgow Math. J., 45, 415–426 (2003).
B. Watson, “New examples of strictly almost Kähler manifolds,” Proc. Am. Math. Soc., 88, 541–544 (1983).
G. Whitehead, “Note on cross-sections in Stiefel manifolds,” Comment. Math. Helv., 34, 239–240 (1962).
K. Yano, Differential Geometry on Complex and Almost Complex Spaces, Pergamon Press, Oxford (1965).
K. Yano and S. Ishihara, “Almost contact structures induced on hypersurfaces in complex and almost complex spaces,” Kodai Math. Sem. Rep., 17, No. 3, 222–249 (1965).
K. Yano and M. Kon, Structures on Manifolds, World Scientific, Singapore (1984).
K. Yano and T. Sumitomo, “Differential geometry of hypersurfaces in a Cayley space,” Proc. Roy. Soc. Edinburgh. Sec. A, 66, 216–231 (1962–1964).
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Translated from Itogi Nauki i Tekhniki, Seriya Sovremennaya Matematika i Ee Prilozheniya. Tematicheskie Obzory. Vol. 126, Geometry, 2013.
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Banaru, M.B. Geometry of 6-Dimensional Hermitian Manifolds of the Octave Algebra. J Math Sci 207, 354–388 (2015). https://doi.org/10.1007/s10958-015-2377-6
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DOI: https://doi.org/10.1007/s10958-015-2377-6