Mariano SuárezAlvarez♦ (moderator)
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 352Proofs without words
 219How can adding an infinite number of rationals yield an irrational number?
 206Proofs without words
 107Periods and commas in mathematical writing
 106What's a proof that the angles of a triangle add up to 180°?
 81Proving the identity $\sum_{k=1}^n {k^3} = \big(\sum_{k=1}^n k\big)^2$ without induction
 79Why do mathematicians use singleletter variables?
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