Predicate logic proof, can't get to the right solution
111862
Proof for sequent (Logic)
147556
Express logic puzzles with proposition calculus notation
51877
Why is this 'Proof' by induction not valid?
32244
Propositional Logic - Deduction
143627
Use the Fitch system to prove the tautology (p ∨ ¬p)
150451
Logic soundness and completeness
32181
A logic puzzle involving a balance.
105545
Confused about language and words in logic
76635
Proof through combinatorial argument
103463
Mantel's Theorem proof verification
37134
How can I solve this logic question using propositional logic (Natural deduction)?
141814
Proofs using theorems instead of axioms
20658
Difficulty in finding a counterexample
14849
Decidability of a predicate.
70311
Trying to prove (A ∩ B) − C = (A − C) ∩ (B − C)
148790
Basic question about proofs with the goal $\exists x P(x)$
45204
Combinatorial proofs: having a difficult time understanding how to write them out