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Bearistotle's wisdom (lemmy.world)

submitted 2 months ago by PugJesus@lemmy.world to c/historymemes@lemmy.world

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[–] twopi@lemmy.ca 5 points 2 months ago* (last edited 2 months ago) (1 children)

Your example is incorrect.

All cats are peanut butter (c is a subset of p)
some peanut butter are dogs (p intersects d, or, d is a subset of p)
some cats are dogs (c and d intersect, or, d is a subset of c)

The first two do not make the third.

You can have:

c is a subset of p,
d and p intersect,
The section of p that intersects with d does not contain any c

To fix this, reverse the first statement.

All peanut butter are cats (p is a subset of c)
some peanut butter are dogs (p intersects d, or, d is a subset of p)
some cats are dogs (c and d intersect, or, d is a subset of c)

Any portion of d that intersects with p (some p is d) must also be c (since all p is in c). Hence some c, but not all c, is in the portion of p that intersects with d (some c is d).

[–] Zozano@aussie.zone 3 points 2 months ago* (last edited 2 months ago)

Oops. I fucked up lol. I changed it with your edit :p

Mental note: don't do syllogisms at 1am.