Selected Problems and Theorems of Elementary Mathematics
D. O. Shklarsky, N. N. Chentzov, I. M. Yaglom
D. O. Shklarsky, N. N. Chentzov, I. M. Yaglom
Algebra, Geometry, International Mathematical Olympiads, Math contests, Puzzles, Brainteasers, Number Theory, Combinatorics, Logic, Paradox
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