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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] 5 points 9 months ago (1 children)

Is this from Principia Mathematica or smth?

[–] [email protected] 7 points 9 months ago

This looks like classical ordinal set theory in relatively modern notation. I’d guess that Principia Mathematica uses batshit notation compared to this but I haven’t read it.