This is an exercise I have at university, Math. Logics, Axiomatic Theory. I would aprecciate any help, because I don't understand this subject. Any sophisticated answers are welcome. Thanks in advance.
2026-04-20 09:42:30.1776678150
How to derive the following formula ∃x∃yP(x,y)⇒∃y∃xP(x,y)?
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