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Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
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a easy problem about set axiom
by lenohard
Help Me !
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2013-03-14 20:13:21
by lenohard
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