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addition rule (lemmy.world)

submitted 9 months ago by [email protected] to c/[email protected]

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[–] [email protected] 11 points 9 months ago (1 children)

what's with the square at the end? isn't that usually for proofs?

[–] [email protected] 15 points 9 months ago

yeah but sometimes when the textbook authors are feeling particularly mischievous they'll just put them in random places. and sometimes they'll even skip the proofs but keep the square.