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15
112
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Unsure about determining an argument's validity

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#logic #examples-counterexamples #predicate-logic #quantifiers
69
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Help proving the equivalence of lower semicontinuity and sequential lower semicontinuity involving the negation of a stament with multiple quantifiers

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#real-analysis #general-topology #calculus-of-variations #quantifiers
38
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Are there terminating methods to provide models of first-order theory formulae?

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#first-order-logic #predicate-logic #quantifiers #decidability #quantifier-elimination
16
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Does quantifier elimination preserve equi-satisfiability or equivalence?

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#first-order-logic #quantifiers #satisfiability #quantifier-elimination
73
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Universe of discourse in quantifiers

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#logic #quantifiers
48
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How to prove vacuous quantifier

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#first-order-logic #quantifiers #derivations
29
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Predicate logic and material equivalence.

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#first-order-logic #quantifiers
77
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Does $\forall x \exists y (P(x) \land Q(y))$ imply $\forall x P(x)$?

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#first-order-logic #quantifiers
65
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What is the error in this deduction of $ \exists x (P) \leftrightarrow P$?

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#logic #first-order-logic #predicate-logic #quantifiers
24
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Confusion on Locally Integrable Function Induced Measure is Regular

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#real-analysis #integration #measure-theory #proof-explanation #quantifiers
101
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Necessity of the Replacement Theorem for erasing null quantifiers

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#logic #solution-verification #predicate-logic #quantifiers
67
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What's the domain of $x$ in the RHS of the following logical equivalence, $\forall x \in D, P(x) \equiv \forall x, x \in D \rightarrow P(x)$?

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#logic #quantifiers
79
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Problem understanding quantifier for x in epsilon-delta definition of a limit

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#real-analysis #calculus #limits #epsilon-delta #quantifiers
61
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Is this a valid way to derive the second quantifier negation law from the first one?

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#logic #solution-verification #quantifiers
109
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Does 'if and only if' flip a quantifier?

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#logic #predicate-logic #quantifiers

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