this post was submitted on 02 Apr 2024
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[–] [email protected] -4 points 7 months ago* (last edited 7 months ago) (1 children)

"Every person in Japan will be called Sato."

In formal logic, this is equivalent to
"There is no person in Japan not called Sato."

Since there are no people, no one is not called Sato, and therefore every person is called Sato. Every person is also called Steve. Or Klaus.

Edit: once you take the second part of the headline about the marriage law into account you're right, my bad ^-^

[–] [email protected] 6 points 7 months ago (1 children)

Since there are no people, no one is not called Sato, and therefore every person is called Sato.

Uh... No? 🤨

[–] [email protected] -2 points 7 months ago (1 children)

∀P∈{X | X lives in Japan} : P is named Sato

using De Morgan's negation rule this is equivalent to

⇔ ∄ P ∈{X | X lives in Japan} : P is not named Sato

Since {X | X lives in Japan} = ∅ is the empty set, such a person P can by definition not exist. Which means, the first statement is true. If no person lives in Japan, that means every person living in Japan is named Sato.

[–] [email protected] 8 points 7 months ago (1 children)

Your proof is vacuous and you should feel vacuous!

[–] [email protected] 3 points 7 months ago