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References to 'pigeonhole principle'
1. a finite integral domain is a field by yark
2. arrows relation by Henry
3. Behrend's construction by bbukh
4. dual of Dilworth's theorem by justice
5. every permutation has a cycle decomposition by rspuzio
6. index of set theory by rspuzio
7. K\"onig's lemma by mps
8. nonogram by mps
9. proof of fundamental theorem of algebra (due to D'Alembert) by rspuzio
10. proof of Lagrange's four-square theorem by CWoo