First Order Logic

First Order Logic (FOL) is a “language” you learn in formal logic classes.  What does it look like?  Let’s take this sentence that my professor made up for class:

Neither Phineus nor Ferb nor Candace hates Doofenshmirtz, but they all annoy him.”

It would look something like this in FOL:

¬(hates(p, d) ∨ hates(f, d) ∨ hates(c, d)) ∧ annoys(p, d) ∧ annoys(f, d) ∧ annoys(c, d)

Weird.  And that’s just the simple stuff.

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