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Questions asking for the intuition behind some definition, conjecture, proof etc. In other words, questions designed to improve or to acquire understanding on a conceptual or intuitive level, as opposed to on a technical or formal level. When asking such a question it can be helpful to include a rough description of ones understanding of the subject at hand (on a technical level).
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).
12
votes
Proofs without words
Gluing two Mobius strips along their edges is a Klein bottle.