Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**lenohard****Member**- Registered: 2013-03-14
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are there two sets A and B which satisfacting A={A,B} according to the set axiom 1to5.

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