Yan X. Zhang

collaborators

4 papers

math.CO2026

Solution of ErdÅs Problem 633

Michael Beeson, Miklos Laczkovich, Yan X. Zhang

We classify triangles that can be tiled only into a square number of congruent triangles, settling ErdÅs Problem 633.

math.CO2026

Tiling Triangles with $2 I ¨ /3$ Angles

Yan X Zhang

Motivated by a question of ErdÃ¶s and inquiries by Beeson and Laczkovich, we explore the possible $N$ for which a triangle $T$ can tile into $N$ congruent copies of a triangle $R$ .…

math.CO2026

Rationality of certain triangle tilings

Michael Beeson, Yan X Zhang

We consider tilings of a triangle $A B C$ by congruent copies of a triangle that has one angle equal to $12 0^{\circ}$ , has non-commensurable angles (that is, not all angles are rationa…

math.CO2024

Pure Simplicial and Clique Complexes with a Fixed Number of Facets

Kassahun H Betre, Yan X Zhang, Carter Edmond

We study structural and enumerative aspects of pure simplicial complexes and clique complexes. We prove a necessary and sufficient condition for any simplicial complex to be a cliq…

Solution of ErdÅs Problem 633

Tiling Triangles with 2I¨/3 Angles

Rationality of certain triangle tilings

Pure Simplicial and Clique Complexes with a Fixed Number of Facets

Solution of ErdÅs Problem 633

Tiling Triangles with $2 I ¨ /3$ Angles