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Somewhat tangentially relevant, one of the reasons people find math particularly hard is because many people come into math with attitude that some things are "

Somewhat tangentially relevant, one of the reasons people find math particularly hard is because many people come into math with attitude that some things are "obvious", "self-explanatory", "common sense".

manicdee 8y ago
And then we find that mathematicians have wicked senses of humour so use words like “common sense” as a self-deprecatory reference to the decade they spent finding the proof :D
geezerjay 8y ago
"The proof is trivial and is left as an exercise to the reader." Sometimes it's infuriating.