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79 votes

Small ideas that became big

55 votes

The "square root" of a graph?

21 votes

A necessary and sufficient condition for $(x_1,...,x_n)$ to be a permutation of $(1,...,n)$

17 votes

Examples of back of envelope calculations leading to good intuition?

14 votes

Is each squared finite group trivial?

10 votes

A toy model in 0-d QFT

7 votes

When is there a subring of the complex numbers surjecting onto a given field of prime characteristic?

5 votes

Asymmetric $A \iff B$ proofs

3 votes

Size of intersecting families on $\{1,\ldots,n\}$

2 votes

Is Hilbert basis theorem true for positive graded ring?

1 vote

On the real and finite field rank of a $0/1$ matrix - I