I have to show that the following formula $(∀x∀y(Px→Py)→(∀xPx∨∀x¬Px))$ is valid in the first order logic using the tableau's system. I included a picture with my attempt.
Is it correct?
Thank you.
2026-03-30 18:19:15.1774894755
First order logic: is this tableau correct?
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