Museum of Geometry
(The curator : Hiroyasu TSUCHIHASHI)

Rotation numbers of lissajou curves

Pascal Theorem and its Extension

Geometry on the hyperbolic plane　

Curves of constant width

3dimensional maze

Papers published recently or I'm writing now.

1. "Examples of four dimensional cusp singularities" (J. of Math. Soc. Japan 70)

2. "Fans consisting of infinitely many non-singular cones" (2018/6/30 update)

3. "Double coverings of toric singularities."(2020/4/11 update)