List questions from quantifiers | MathQA

What's the difference between → and ∧ in this context?

Published on 13 Dec 2022 - 11:30

can ∃x∀y and ∀y∃x sometime be equivalence?

Published on 16 Dec 2022 - 3:30

Is ∃x(∀yP(x,y)) and ∃x∀yP(x,y) equivalence?

Published on 16 Dec 2022 - 7:40

Expressing "Someone has visited every country in the world except Libya" using quantifiers

Published on 17 Dec 2022 - 10:06

How to express "$a \leq x \leq a + \frac{y}{n} $ for every $n \geq 1$, then $x = a$" using quantifiers

Published on 23 Dec 2022 - 16:52

how to check an equivalence in first-order logic?

Published on 04 Jan 2023 - 0:22

Does the "nothing" quantifier commute variable-wise? What about the unique existential quantifier?

Published on 12 Jan 2023 - 23:15

Prob. 50, Sec. 1.5, in Rosen's DISCRETE MATHEMATICS, 8th ed: Converting quantified statements into Prenex Normal Form

Published on 14 Jan 2023 - 12:13

$x^2=4 \implies \exists x{=}2(x^2=4)$

Published on 17 Jan 2023 - 4:02

Equational axioms for quantifiers

Published on 23 Feb 2026 - 8:29