I would like to write "A is B" in first order logic. For example "Apple is food". Here are my guesses:
$\exists x, s.t. \forall y, \mbox{food(x) & apple(y) & y} \in x.$
or simply
$food(apple)$
What is the proper expression?
2026-04-01 13:37:05.1775050625
How to express "A is B" in first order logic
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