Give a natural deduction proof of the formula "$p ∨ (p → q)$"
51369
Natural deduction proof of $p \lor (p\implies q)$ with propositional calculus
7003
Inductive proof of a formula for Fibonacci numbers
3109
Prove that $(p+q)^m \leq p^m+q^m$
142762
how to prove that (P⊃Q)≡(¬Q⊃¬P) ( P ⊃ Q ) ≡ ( ¬ Q ⊃ ¬ P ) is disallowed in intuitionistic logic?
45323
How to prove $\vdash\neg P\to (P\to Q)$?
47161
Quick logic question about $P\leftrightarrow Q$, terminology
106401
Prove: $p-mq | f(m)$ where $m$ is any integer
21035
Clarifying on how if p,q is logically equivalent to p only if q
76347
Shorter proof for some equvalences
116978
Trying to prove $p,p \to (r \to q) \vdash (\neg q \to \neg r)$ by using natural deduction.
48051
Proof related to natural numbers
69875
Prove the commutativity property of addition of natural numbers by induction
12949
Inductive Proof of Euler's Formula $v-e+r=2$
48213
proving logical equivalence $(P \leftrightarrow Q) \equiv (P \wedge Q) \vee (\neg P \wedge \neg Q)$
103463
Mantel's Theorem proof verification
45481
Prove or disprove validity: $(\forall x \exists y (P(x) \supset Q(y))) \supset(\exists y \forall x (P (x) \supset Q(y)))$
111862
Proof for sequent (Logic)