Question

Problems teaching introductory logic. Is this a statement? "If x is an integer, then..."

score 505 · Answer 1 · 2026-03-26 01:14:49

505

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Problems teaching introductory logic. Is this a statement? "If x is an integer, then..."

Published on 26 Mar 2026 - 1:14

score 140 · Answer 2 · 2026-03-26 01:11:54

140

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Why is $∧$ used in the right-hand side of $¬(∀x, P(x) → (Q(x) ∧ R(x))) ≡ ∃x, P(x) ∧ (¬Q(x) ∨ ¬R(x))$?

Published on 26 Mar 2026 - 1:11

score 207 · Answer 3 · 2018-08-10 16:17:32

207

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Quantifying a free variable in an example from "How To Prove It" by Velleman

Published on 10 Aug 2018 - 16:17

score 103 · Answer 4 · 2018-08-10 16:38:35

103

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Is $\lnot\forall x(Px \lor Qx) \equiv \lnot(\forall x(Px \lor Qx))?$

Published on 10 Aug 2018 - 16:38

score 99 · Answer 5 · 2018-08-13 16:08:58

99

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What does the existential quantifier imply about the variable it comes before?

Published on 13 Aug 2018 - 16:08

score 48 · Answer 6 · 2018-09-01 12:07:01

48

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How does negating work in quantified statements

Published on 01 Sep 2018 - 12:07

score 655 · Answer 7 · 2018-09-04 17:15:42

655

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"Exactly Two" - Are these statements logically equivalent?

Published on 04 Sep 2018 - 17:15

score 137 · Answer 8 · 2026-03-25 18:18:45

137

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Quantificational formatting and going from using logic with words, to using it for math proofs

Published on 25 Mar 2026 - 18:18

score 324 · Answer 9 · 2018-09-08 21:59:27

324

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Two formulas with different free variables not semantically equivalent

Published on 08 Sep 2018 - 21:59

score 291 · Answer 10 · 2026-03-25 01:14:20

291

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"Many" quantifier in first order logic

Published on 25 Mar 2026 - 1:14

score 261 · Answer 11 · 2018-09-16 01:03:12

261

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How do you interpret statements that can be either true or false at different times, on a truth table?

Published on 16 Sep 2018 - 1:03

score 244 · Answer 12 · 2018-09-18 15:48:53

244

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Discrete math contrapositive statment of universal statement

Published on 18 Sep 2018 - 15:48

score 511 · Answer 13 · 2026-03-25 16:03:35

511

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What is "the quantifier axioms of L" and why are they true in all L-structures?

Published on 25 Mar 2026 - 16:03

score 136 · Answer 14 · 2018-09-29 18:36:37

136

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What Quantifier is Used When Assuming P(n) for some n, in the Induction Hypothesis?

Published on 29 Sep 2018 - 18:36

score 133 · Answer 15 · 2018-10-02 20:18:48

133

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Necessity of universal quantifier in predicate calculus

Published on 02 Oct 2018 - 20:18

List Question

Problems teaching introductory logic. Is this a statement? "If x is an integer, then..."

Why is $∧$ used in the right-hand side of $¬(∀x, P(x) → (Q(x) ∧ R(x))) ≡ ∃x, P(x) ∧ (¬Q(x) ∨ ¬R(x))$?

Quantifying a free variable in an example from "How To Prove It" by Velleman

Is $\lnot\forall x(Px \lor Qx) \equiv \lnot(\forall x(Px \lor Qx))?$

What does the existential quantifier imply about the variable it comes before?

How does negating work in quantified statements

"Exactly Two" - Are these statements logically equivalent?

Quantificational formatting and going from using logic with words, to using it for math proofs

Two formulas with different free variables not semantically equivalent

"Many" quantifier in first order logic

How do you interpret statements that can be either true or false at different times, on a truth table?

Discrete math contrapositive statment of universal statement

What is "the quantifier axioms of L" and why are they true in all L-structures?

What Quantifier is Used When Assuming P(n) for some n, in the Induction Hypothesis?

Necessity of universal quantifier in predicate calculus

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