"false implies true" is a true statement
578
In classical logic, why is $(p\Rightarrow q)$ True if both $p$ and $q$ are False?
130028
Why is a statement "vacuously true" if the hypothesis is false, or not satisfied?
158600
Are these two statements equivalent?
98320
True or false? $\bigwedge_{i \in I} \bigvee_{j \in J}a_{i,j} \equiv \bigvee_{j \in J} \bigwedge_{i \in I}a_{i,j}$
10598
Contrapositive Fitch Proof
134120
Prove statement with a counter-example: For all sets S, T and V, V ∪ (S ∩ T) = (V ∪ S) ∩ T is false
109858
How could a statement be true without proof?
141294
Does "if ([bool] == true)" require one more step than "if ([bool])"?
40675
Regarding Evaluated True
133194
Can we prove reality?
22193
Why, logically, is proof by contradiction valid?
135957
Why in an inconsistent axiom system every statement is true? (For Dummies)
51863
Logical Conditional Truth Table Rationale
87928
Proof of logical equivalence of biconditional and other proposition
137494
Why is "If ψ ∈ Γ then the sequent (Γ ⊢ ψ) is correct" true?
23730
Why is 'True == not False' a syntax error in Python?
32441
How to prove or disprove statements about sets