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Results tagged with alternative-proof
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user 90655
Looking for a proof different from the standard proof(s) of a result
12
votes
Proofs without words
Gluing two Mobius strips along their edges is a Klein bottle.
2
votes
Proofs without words
Michael Goldberg, Constructions possible by ruler and compasses, Math. Mag. Vol. 51, No. 5, p. 283 (1 page) (Nov., 1978).