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More Characterizations of Certain Special Families of Simplices

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Abstract

This paper is about various characterizations of orthocentric, and other special types of, d-dimensional simplices and related issues. It puts together several three-dimensional results that are scattered in the literature, and establishes stronger versions and extensions to higher dimensions. These compactly organized results, which are mostly new for higher dimensions, are expected to be very useful tools for further research. Several open problems are posed.

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References

  1. Barbeau, E.J., Klamkin, M.S., Moser, W.O.J.: Five Hundred Mathematical Challenges, Math. Assoc. America, Washington, D.C. (1995)

  2. Berger M.: Geometry I. Springer, Berlin (1994)

    Google Scholar 

  3. Boltyanski, V., Martini, H., Soltan, V.: Geometric Methods and Optimization Problems. Kluwer, Dordrecht (1999)

  4. Brown B.H.: A theorem on isogonal tetrahedra. Am. Math. Mon. 31, 371–375 (1924)

    Article  MathSciNet  MATH  Google Scholar 

  5. Buba-Brzozowa, M., Witczyński, K.: Some properties of orthocentric simplices. Demonstr. Math. 37, 191–195 (2004) (reviewed in Zbl. Math. 1054.51009 by H. Havlicek)

  6. Couderc P., Ballicioni A.: Premier Livre du Tétraèdre. Gauthier-Villars, Paris (1935)

    Google Scholar 

  7. Court N.A.: Notes on the orthocentric tetrahedron. Am. Math. Mon. 41, 499–502 (1934)

    Article  MathSciNet  MATH  Google Scholar 

  8. Court N.A.: The tetrahedron and its altitudes. Scripta Math. 14, 85–97 (1948)

    MathSciNet  MATH  Google Scholar 

  9. Court N.A.: Modern Pure Solid Geometry. Chelsea Publishing Company, New York (1964)

    MATH  Google Scholar 

  10. Edmonds A.L., Hajja M., Martini H.: Orthocentric simplices and their centers. Results Math. 47, 266–295 (2005)

    Article  MathSciNet  MATH  Google Scholar 

  11. Fiedler M.: Isodynamic systems in Euclidean spaces and an n-dimensional analogue of a theorem by Pompeiu. Časopis Pest. Mat. 102, 370–381 (1977)

    MathSciNet  MATH  Google Scholar 

  12. Gelca R., Andreescu T.: Putnam and Beyond. Springer, New York (2007)

    Book  MATH  Google Scholar 

  13. Gerber L.: The orthocentric simplex as an extremal simplex. Pac. J. Math. 56, 97–111 (1975)

    Article  MathSciNet  MATH  Google Scholar 

  14. Gerber L.: Associated and perspective simplexes. Trans. Am. Math. Soc. 201, 43–55 (1975)

    Article  MathSciNet  MATH  Google Scholar 

  15. Hajja M.: The Gergonne and Nagel centers of an n-dimensional simplex. J. Geom. 83, 46–56 (2005)

    Article  MathSciNet  MATH  Google Scholar 

  16. Hajja M.: Coincidences of centers of edge-incentric, or balloon, simplices. Results Math. 40, 237–263 (2006)

    Article  MathSciNet  MATH  Google Scholar 

  17. Hajja M., Hammoudeh I.: The sum of measures of the angles of a simplex. Beitr. Algebra Geom. 55, 453–470 (2014)

    Article  MathSciNet  MATH  Google Scholar 

  18. Hajja M., Martini H.: A note on similar-perspective triangles. J. Geom. Graphics 10, 133–136 (2006)

    MathSciNet  MATH  Google Scholar 

  19. Hajja M., Martini H.: Orthocentric simplices as the true generalizations of triangles. Math. Intell. 35(3), 16–28 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  20. Hajja M., Walker P.: The Gergonne and Nagel centers of a tetrahedron. J. Geom. 75, 106–112 (2002)

    MathSciNet  MATH  Google Scholar 

  21. Hajja M., Walker P.: The inspherical Gergonne center of a tetrahedron. J. Geom. Graphics 8, 23–32 (2004)

    MathSciNet  MATH  Google Scholar 

  22. Klamkin, M.S.: Quickie 809, Math. Mag. 66, 265 (1993) (solution in p. 272)

  23. Klamkin, M.S.: Problem 10453. Am. Math. Mon. 105, 463 (1995) [solution in Am. Math. Mon. 108, 563–565, (1998)]

  24. Klamkin, M.S.: Problem 1641. Math. Mag. 75, 63–64 (2002) [solution in Math. Mag. 67, 71–72 (2003)]

  25. Klamkin, M.S.: Quickie 946. Math. Mag. 77, 397 (2004) (solution in p. 403)

  26. Kupitz, Y.S., Martini, H.: Geometric aspects of the generalized Fermat–Torricelli problem. In: Bárány, I., Böröczky, K. (eds.) “Intuitive Geometry”, Eds. , Bolyai Soc. Math. Studies, vol. 6, pp. 55-127 (1997)

  27. Lob H.: The orthocentric simplex in space of three and higher dimensions. Math. Gaz. 19, 102–108 (1935)

    Article  MATH  Google Scholar 

  28. Mandan S.R.: Isodynamic and isogonic simplexes. Ann. Math. Pura Appl. (4) 53, 45–55 (1961)

    Article  MathSciNet  MATH  Google Scholar 

  29. Prasolov, V.V., Tikhomirov, V.M.: Geometry, Translations of Mathematical Monographs, vol. 200. Amer. Math. Soc., R.I. (2001)

  30. Rosenbaum, J.: Problem 3644, Am. Math. Mon. 40, 561 (1933) [solution by J.W. Clawson, Am. Math. Mon. 42, 51–53 (1935)]

  31. Roussos I.M.: On the Steiner minimizing point and the corresponding algebraic system. College Math. J. 43, 305–308 (2012)

    Article  MathSciNet  MATH  Google Scholar 

  32. Wood F.E.: Similar-perspective triangles. Am. Math. Mon. 36, 67–73 (1929)

    Article  MathSciNet  MATH  Google Scholar 

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Hajja, M., Hayajneh, M. & Martini, H. More Characterizations of Certain Special Families of Simplices. Results. Math. 69, 23–47 (2016). https://doi.org/10.1007/s00025-015-0456-0

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