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New posts in open-problem
What are some things we can prove they must exist, but have no idea what they are?
soft-question
big-list
open-problem
What is the oldest open problem in geometry?
geometry
soft-question
math-history
open-problem
Open mathematical questions for which we really, really have no idea what the answer is
soft-question
big-list
conjectures
open-problem
What is the smallest number of $45^\circ-60^\circ-75^\circ$ triangles that a square can be divided into?
geometry
puzzle
recreational-mathematics
open-problem
tiling
Past open problems with sudden and easy-to-understand solutions
soft-question
math-history
big-list
open-problem
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