👉 Equipollentness is a concept in logic and mathematics that refers to two propositions being equivalent or interchangeable, meaning they have the same truth value. In other words, if one proposition is true, then so is the other. It can be expressed mathematically as ∀x (p(x) → q(x)). This concept is particularly useful in logical reasoning because it allows us to examine whether two propositions are logically equivalent without having to check all possible combinations of their truth values.