How would I go about proving P>Q from the premise (notP v Q)?
113605
In Fitch, how does one prove "(P → Q)" from the premise "(¬P ∨ Q)"?
578
In classical logic, why is $(p\Rightarrow q)$ True if both $p$ and $q$ are False?
72144
Show that $\mathbb Q(\sqrt p) \not\simeq\mathbb Q(\sqrt q)$
65379
Deriving $\neg R$ from $\{R↔(R∨(P∧¬P)), R↔¬P, ¬P→(P↔(Q→Q)), P→Q\}$
136427
Given $∃y.∀x.p(x,y)$, use the Fitch system to prove $∀x.∃y.p(x,y)$
83407
How to show that that $q \mid p-1$?
32027
Given (p ∧ q), use the Fitch system to prove (q ∨ r)
90970
How to prove the line exist?
151038
How to prove (A v B), (A → C), (B → D) therefore (C v D)
48368
Prove using Natural Deduction in predicate logic $(\forall x\ P(x))\to Q ⊢ \exists x (P(x)\to Q)$
67031
use contradiction to prove that the square root of $p$ is irrational
77759
How do i prove that $(p \vee q) \wedge (\neg p \vee r) \rightarrow (q \vee r)$ is a tautology without using the truth table?
142762
how to prove that (P⊃Q)≡(¬Q⊃¬P) ( P ⊃ Q ) ≡ ( ¬ Q ⊃ ¬ P ) is disallowed in intuitionistic logic?
116978
Trying to prove $p,p \to (r \to q) \vdash (\neg q \to \neg r)$ by using natural deduction.
140194
Using natural deduction to prove that $p \implies q \vdash \lnot p \lor q$
47161
Quick logic question about $P\leftrightarrow Q$, terminology
143248
What approach should I take to establish this logical proof?