Given (p ∧ q), use the Fitch system to prove (q ∨ r).
32027
Given (p ∧ q), use the Fitch system to prove (q ∨ r)
153670
Prove that if $a \mid b$ and $b \mid c$, then $a \mid c$.
144693
Show that if $B \subseteq C$, then $\mathcal{P}(B) \subseteq \mathcal{P}(C)$
113065
Proving equivalences of statements equivalent to AC
76635
Proof through combinatorial argument
79407
How to solve ~(P → Q) : P & ~Q by natural deduction?
48368
Prove using Natural Deduction in predicate logic $(\forall x\ P(x))\to Q ⊢ \exists x (P(x)\to Q)$
88188
Explain proof by contradiction.
9282
Prove using natural deduction $((P \land Q) \rightarrow R) \vdash (P \rightarrow R) \lor (Q\rightarrow R)$
144396
fitch style proof problem regarding rule of inferences
108367
proving tautologically equivalent
37196
"If P, then Q; If P, then R; Therefore: If Q, then R." Fallacy and Transitivity
87257
How to prove this sequent using natural deduction?
116978
Trying to prove $p,p \to (r \to q) \vdash (\neg q \to \neg r)$ by using natural deduction.
61671
Discrete Math: Writing Proofs
121720
Given ∃x.¬p(x), use the Fitch System to prove ¬∀x.p(x).
37134
How can I solve this logic question using propositional logic (Natural deduction)?