Trying to solve $(p\rightarrow(q\rightarrow r))\wedge\neg r\vdash p\rightarrow\neg q$ with natural deduction (fitch style)
116978
Trying to prove $p,p \to (r \to q) \vdash (\neg q \to \neg r)$ by using natural deduction.
37134
How can I solve this logic question using propositional logic (Natural deduction)?
85770
What is the difference between ∀x(p(x) →q(x)) and ∀x(p(x) ∧q(x))?
62224
Need help with proof for Dedekind cuts on $\mathbb{Q}^+$
139064
Show by using logical connectives laws that $(P\to Q) \land (Q \to R) $ is equivalent to $(P \to R) \land [(P \iff Q) \lor (R \iff Q)]$
57215
Stuck on formal proofs. Not sure how to continue
10540
Prove $\vdash \neg(\square F\land p)$ in $KD$
40343
Solutions of $p!q! = r!$
34768
Proving $(p \oplus q) \oplus r=p \oplus (q \oplus r)$
21035
Clarifying on how if p,q is logically equivalent to p only if q
134384
What does $\rightarrow$ mean in $p \rightarrow q$
40048
Finding the fallacy in this broken proof
45323
How to prove $\vdash\neg P\to (P\to Q)$?
92492
Natural Deduction: $(p \lor q)\to r\vdash p \to r$ and $p\to\neg q\leftrightarrow(r\lor s),\neg s\vdash (p\land \neg q)\to r$
151356
Need Hints Prove "$((\neg \alpha \to \alpha) \to \alpha) $" Using Axiom 1,2,3 and MP and deduction theorem
52585
How to prove that $[(p \to q) \land (q \to r)] \to (p \to r)$ is a tautology without using the truth table?
143627
Use the Fitch system to prove the tautology (p ∨ ¬p)