help prove this propositional logic equivalency
36114
conjunction of disjunctions and disjunction of conjunctions
77286
Proving set theory question
111862
Proof for sequent (Logic)
87257
How to prove this sequent using natural deduction?
53915
prove that $a \equiv b \mod m$ is an equivalence relation on the integers
9158
Proving that a propositional theory of any cardinality has an independent set of axioms
48213
proving logical equivalence $(P \leftrightarrow Q) \equiv (P \wedge Q) \vee (\neg P \wedge \neg Q)$
49994
Deduction of $\forall y \exists x (x=y)$
34768
Proving $(p \oplus q) \oplus r=p \oplus (q \oplus r)$
89535
fake proof of $\forall a. \forall b. a = b \to 1 = 0$
3979
Limit comparison test proof
45323
How to prove $\vdash\neg P\to (P\to Q)$?
139064
Show by using logical connectives laws that $(P\to Q) \land (Q \to R) $ is equivalent to $(P \to R) \land [(P \iff Q) \lor (R \iff Q)]$
116527
Validating a proof for necessary and sufficient conditions on sets A & B such that $P(A) \cup P(B) = P(A\cup B)$
113605
In Fitch, how does one prove "(P → Q)" from the premise "(¬P ∨ Q)"?
23946
Prove the definitions of $e$ to be equivalent
142840
Open axioms of equality