It's an FOL proof
Thank you so much!
2026-04-03 19:19:26.1775243966
I'm almost finished with this logical proof but I can't figure out the very end! Could someone take a look? :)
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On line 3 you should assume $F(a)$
Remember you are setting up an $\exists$ Elim on $\exists x \ F(x)$ (Indeed, line 7 should refer to premise 2, not 1) and so you should take the formula $F(x)$ and substitute a constant for the $x$.