What is ( standardly) the official status of " Truth" and " Falsity " in propositional logic?
139455
What is the correct reading of $\bot$?
6535
Proof of for-all / there-exists "negation"?
129652
Meaning of "strong" and "weak" (formulas?) in propositional logic
68880
propositional calculus problem, how to prove this right or wrong?
129185
Understanding the truth value for ⇏ when antecedent is false and consequent is true.
37196
"If P, then Q; If P, then R; Therefore: If Q, then R." Fallacy and Transitivity
113640
Why is there this strange contradiction between the language of logic and that of set theory?
7132
Finding a clear difference between truth and fact
135957
Why in an inconsistent axiom system every statement is true? (For Dummies)
40675
Regarding Evaluated True
22193
Why, logically, is proof by contradiction valid?
45481
Prove or disprove validity: $(\forall x \exists y (P(x) \supset Q(y))) \supset(\exists y \forall x (P (x) \supset Q(y)))$
131257
$\to$ vs. $\vdash$ in logic
134034
Is logic subjective?
47926
What is the logical form of the definition of validity?
15504
In classical logic, why is $(p\Rightarrow q)$ True if $p$ is False and $q$ is True?
52322
Implication in mathematics - How can A imply B when A is False?