Confusion in Math Logic Implications
62160
Conditional Statements: "only if"
109159
What's the intuition behind $(\exists y)(\mathscr{C}(y)\supset\mathscr{D})\supset((\forall x)\mathscr{C}(x)\supset\mathscr{D})$
73231
Why in implication, if premise is false then implication is true?
17073
Using proof by contradiction vs proof of the contrapositive
109685
An invalid argument, the conclusion of which is a tautology
93557
Intuitively, why does (B → S) ≡ (¬B ∨ S)?
109325
Euclid Lemma proof reasoning
46160
What is the difference between implication symbols: $\rightarrow$ and $\Rightarrow$?
136584
Understanding connection between terms tautology, contradiction, contingent, satisfiable, unsatisfiable, valid and invalid
115996
Misleading Definitions and Unanswerable Problems in Spivak's Calculus
29629
Distinguishing between valid and fallacious arguments (propositional calculus)
41182
What does the construct x = x || y mean?
75600
Is Gödel's modified liar an illogical statement?
142526
What's the intuition behind difference of $\neg(S\land E)$ and $\neg S \land \neg E$?
155592
Conditional conundrum
116135
A paradox related to computable reals?
40048
Finding the fallacy in this broken proof