Truth with Universal and Existential Quantifiers
1027
Why is this true? $(\exists x)(P(x) \Rightarrow (\forall y) P(y))$
72034
Truth table and the meaning of $\oplus$ in propositional logic
29110
Propositional Intuitionistic Logic Question
147051
Soundness vs completeness, am I understanding? And proving soundness?
130415
Negating quantifiers with brackets
27104
Confused between Nested Quantifiers
103112
Does the existential quantifier distribute over an implication?
101877
Assumed True until proven False. The Curious Case of the Vacuous Truth
101741
Selection of logical connectives {¬,∨,∧,⇒,⇔} in set theory?
108367
proving tautologically equivalent
140194
Using natural deduction to prove that $p \implies q \vdash \lnot p \lor q$
125950
Proof strategy involving first order logic for existential quantification at very beginning
28281
Different standards for writing down logical quantifiers in a formal way
14849
Decidability of a predicate.
45481
Prove or disprove validity: $(\forall x \exists y (P(x) \supset Q(y))) \supset(\exists y \forall x (P (x) \supset Q(y)))$
94617
Showing Consistency and Completeness implies a unique truth assignment
106797
Truth Tables for Digital Circuits