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

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#1 Re: This is Cool » Proof without words - 2 » 2011-01-13 17:09:15

this is not proof, though. can you prove it in general?

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