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Hilbert System with propositional logic $p \rightarrow q,\neg q \vdash \neg p$

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Natural Deduction Tautology

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Fitch-Style Proof

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Fitch style proof of $(\neg B \to \neg A) \leftrightarrow (A \to B)$

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Fitch-Style Proof Help

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Is there a proof of this statement about deductions?

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176
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proving{$\neg(\forall x)\alpha \rightarrow \alpha$}$\models$$(\forall x)\alpha$

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773
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Can universal instantiation be used more than once?

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257
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Consistent Set of Sentences is Consistent in Expanded Language

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128
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Why is the assumption needed in this conditional introduction?

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Injective function proof involving floor function

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Subproof in Fitch style system

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How to prove math theorems in formal logic or at least in the style of natural deduction?

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How to prove that $P \rightarrow Q$ is equivalent with $\neg P \lor Q $?

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265
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Natural deduction proof - I don't' understand the question

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