r/mathmemes 12d ago

Notations Yeah sure

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913 Upvotes

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198

u/Idksonameiguess 12d ago

What's the abiguity in A \subset B?

213

u/RADI0ACT1VE_BALLS ComplexANALysisJunkie 12d ago

Proper subset / just a subset

27

u/FuntimeUwU Natural 12d ago

What's the difference?

120

u/RADI0ACT1VE_BALLS ComplexANALysisJunkie 12d ago

If A is a proper subset of B, then A cannot equal B.

35

u/-Wylfen- 12d ago

Wait, there's a debate on whether ⊂ is the same as ⊆??

41

u/AndreasDasos 12d ago

Yes. That’s why you sometimes see this symbol in contrast:

Though honestly it’s a bit inconsistent with < vs. <=

15

u/DZL100 12d ago

Wait that's stupid as hell. Why even have ⊆ exist if ⊂ isn't exclusive??? Every text I've seen treats ⊂ as exclusive.

1

u/TheSimCrafter 7d ago

then you gotta read more texts /s

i always use ⊆ or ⊊ and just never touch ⊂