Die Projektivitätengruppe einer Klasse 4-dimensionaler Translationsebenen Dieter Betten OriginalPaper Pages: 19 - 32
Zur algebraischen Kennzeichnung der Halbordnungen projektiver Ebenen Franz Kalhoff OriginalPaper Pages: 33 - 41
Points of local nonconvexity, clear visibility, and starshaped sets in Rd Marilyn Breen OriginalPaper Pages: 42 - 52
Transitive affine planes admitting elations J. B. FinkN. L. JohnsonF. W. Wilke OriginalPaper Pages: 59 - 65
R2-planes with 3-dimensional automorphism group fixing precisely a line Hansjoachim GrohMartin F. LippertHans -Joachim Pohl OriginalPaper Pages: 66 - 96
An improved Krasnosel'skii theorem for nonclosed sets in the plane Marilyn Breen OriginalPaper Pages: 97 - 100
An alternate proof of the rectilinear art gallery theorem Joseph O'Rourke OriginalPaper Pages: 118 - 130
A characterization theorem for tilings having countably many singular points Marilyn Breen OriginalPaper Pages: 131 - 137
Klassifikation der verallgemeinerten Regelflächen durch ihre Kommerellhyperflächen H. Hagen OriginalPaper Pages: 157 - 163
A characterization of the semi-isometries of a Minkowski plane over a field K F. Radó OriginalPaper Pages: 164 - 183
Representations of SL(2,4) on translation planes of even order Norman L. Johnson OriginalPaper Pages: 184 - 200
