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Apparent logical flaw in statement: ∀x∀yP(x,y)⊢∀x∀yP(y,x)

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128
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"More than two" in First Order Logic

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43
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Translating English to predicate logic with units

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150
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Can implication be false despite its left and right operands being true?

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61
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Is this predicate logic derivation valid?

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50
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How do I express "more than all other X" in FOL?

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47
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Satisfaction of a formula with the universal quantifier

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116
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Problems with nested Predicate in FOL

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66
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Denial of a statement with existential quantifier

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81
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What case and reason to use implication and conjunction?

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40
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For any sentence $\phi$ of first-order logic, the only sentence which is an initial segment of $\phi$ is $\phi$ itself.

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76
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Are these quantified statements logically equivalent?

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44
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What is the difference bwtween an axiom and an axiom schema

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77
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Scoping of function symbols and infering existence

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40
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Predicate logic tree development

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