Prof. Jin Akiyama (Tokai Univercity, Japan), a famous Japanese mathematician and the chief editor of the journal "Graphs and Combinatorics", visited the center from Sep. 14 to Sep. 17 and gave four lectures as following:

Various topics in polyhedra,

The atom of parallelohedra,

Element sets of platonic solids,

Tile-makers & semi-tile-makers.