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Let Δ be a set of sentences. Let ϕ be a sentence. If Δ⊢Mendelson ϕ, then it must be the case that Δ⊢Fitch ϕ.
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??
It is a true/false question
what does it mean?? "Δ⊢Mendelson ϕ" ??
I believe it is one of the unsatisfiability proofs. It is for intro to logic.
I haven't heard terms like "⊢Fitch " and "⊢Mendelson "
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I believe those are just random names added in. The symbol should look like the rotated L
I don't think i can answer question of yours ... :( sorry!!
No worries
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