Derive formal or informal proofs using Modus Ponus and Deduction Theorem - Logic
123458
Prove $( \lnot C \implies \lnot B) \implies (B \implies C)$ without the Deduction Theorem
92492
Natural Deduction: $(p \lor q)\to r\vdash p \to r$ and $p\to\neg q\leftrightarrow(r\lor s),\neg s\vdash (p\land \neg q)\to r$
9282
Prove using natural deduction $((P \land Q) \rightarrow R) \vdash (P \rightarrow R) \lor (Q\rightarrow R)$
87928
Proof of logical equivalence of biconditional and other proposition
4303
Enumerating inside a proposition and inside a proof
79407
How to solve ~(P → Q) : P & ~Q by natural deduction?
122184
De Morgan's laws in logic and set theory
59964
Why an inconsistent formal system can prove everything?
140682
Proving a property of a Logic Formal Language
107281
Proof of Existence of Algebraic Closure: Too simple to be true?
93410
How to prove ~ (~P & ~Q) : P ∨ Q by natural deduction
93342
Show that $\neg$ and $\wedge$ form a functionally complete collection of logical operators.
117661
Distribution Axiom of Modal Logic
135267
Predicate Logic and Inference
131132
Proofs using vector properties
11841
Introduction to proofs with a fair amount of hand-holding?
103653
Interpretations and models in propositional logic