Mariano SuárezAlvarez♦ (moderator)
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 377Proofs without words
 235Proofs without words
 230How can adding an infinite number of rationals yield an irrational number?
 109What's a proof that the angles of a triangle add up to 180°?
 108Periods and commas in mathematical writing
 96Proving the identity $\sum_{k=1}^n {k^3} = \big(\sum_{k=1}^n k\big)^2$ without induction
 83Why do mathematicians use singleletter variables?
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