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Which of the first-order formulae are true in S?

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#logic #predicate-logic #first-order-logic
943
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Natural deduction proof of $(\forall x.P(x))\land(\forall y.P(y) \implies Q(y)) \vdash \forall z.Q(z)$

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#logic #predicate-logic #first-order-logic #natural-deduction #formal-proofs
863
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Derivable rules with quantifiers in first-order logic

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#proof-writing #predicate-logic #first-order-logic
122
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Some questions regarding the proof of validity and invalidity of arguments in Logic.

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#logic #predicate-logic #first-order-logic
619
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“Standardizing variables” in the procedure of converting First Order Logic to CNF?

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#logic #predicate-logic #first-order-logic #conjunctive-normal-form
100
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How does one prove that if $Γ⊢¬∀xψ$ then $Γ⊢¬∀x¬¬ψ$ using the Hilbert System?

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#logic #predicate-logic #first-order-logic
112
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Validity or invalidity of an argument.

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#logic #predicate-logic #first-order-logic
82
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Translation of an argument in logical notation.

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#logic #predicate-logic #higher-order-logic
97
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Propositional Logic: Use resolutions "output" as new formula?

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#logic #propositional-calculus #predicate-logic
82
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Verb is and predicate logic

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#predicate-logic
130
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Resolution method (of first-order predicate logic) to show that the following formulas are unsatisfiable

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#predicate-logic #first-order-logic #satisfiability
469
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Help proving formulas in first order logic using axioms of equality

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#logic #predicate-logic #first-order-logic
764
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Satisfiability in predicate Logic

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#logic #computer-science #predicate-logic
917
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Problem with the compact version of the definition for "exactly one"

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#predicate-logic #first-order-logic
368
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First order logic substitution

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#predicate-logic #first-order-logic #substitution

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