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Results tagged with alternative-proof
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user 25619
Looking for a proof different from the standard proof(s) of a result
11
votes
Proofs without words
I like the tiling proof of the Pythagorean Theorem. The left image is credited to Al-Nayrizi and Thābit ibn Qurra (9th century) and the right by Henry Perigal (19th century).
-9
votes
Proofs without words
This is a "proof without words" by an equation, not a picture.
Three complex numbers $a,b,c$ in the complex plane form the vertices of an
equilateral triangle if and only if $~a^2 + b^2 + c^2 = ab + …