New posts in Predicate Logic

Predicate Logic, Proof of validity . How to remove negation infront of existential quantifier?

Are these formal formulas equivalent?

How do I properly use a logical implication sign when solving an equation?

Is $ \forall x \in \emptyset. (P(x) \land \lnot P(x)) $ true?

Difference between biconditional and logical equivalence

Prove that formula is satisfiable in some infinite structure, but invalid in all finite structures

Writing predicates - is the quantifier necessary?

In what sense is propositional logic "zeroth-order logic?"

When to use which quantifier with predicate logic?

First-order sentence involving only a symmetric binary relation with only infinite models