combinatorics - Draw a line through all doors - Puzzling Stack Exchange

I saw the following problem on 4chan and couldn't solve it: It's very likely to be some kind of troll (no solution). I'm hoping to see some rigorous proofs that disprove the existence of such a l

Computer modelling of materials on the atomic scale

combinations - Find the number of routes - Mathematics Stack Exchange

combinatorics - Draw a line through all doors - Puzzling Stack

Ramsey Theory's Surprising Roots — From Logic to Combinatorics

A Rubik's Cube Cryptosystem-based Authentication and Session Key

Graphene and Beyond: Recent Advances in Two-Dimensional Materials

combinatorics - Draw a line through all doors - Puzzling Stack

Mathematical Puzzles

Combinatorics Introduction, PDF, Discrete Mathematics

soft question - How would you have answered Richard Feynman's

Design Considerations for Oligo(p-phenyleneethynylene) Organic

On partial information retrieval: the unconstrained 100 prisoner

trigonometry - 2018 January Challenge: Prove inequality in