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First Order Logic and equivalence rules

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#discrete-mathematics #first-order-logic
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Show a formula is satisfiable

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#logic #predicate-logic #first-order-logic
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First order logic equivalence proof

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#discrete-mathematics #first-order-logic
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What does "Wenn $x$ frei für $t$ in $\phi$" mean?

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#first-order-logic
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What's the point of allowing only quantification of variables in first-order logic.

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#first-order-logic #formal-languages
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Help with using universal instantiation/generalization when variable ocurrence is unknown.

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#first-order-logic
136
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Are those formulas valid?

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#logic #proof-verification #predicate-logic #first-order-logic
457
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Properties of an elementary substructure

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#model-theory #first-order-logic
99
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Give a derivation in Peano Arithmetic

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#first-order-logic #peano-axioms
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Prove that it is a theorem

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#first-order-logic #peano-axioms
98
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Prove that: $\vdash \forall x(\forall y\alpha)\to \forall y(\forall x \alpha)$

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#logic #first-order-logic
105
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Prove that: $\vdash \forall x \exists !y(y=x)$

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#logic #first-order-logic
224
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Exercise in Peano Arithmetic

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#first-order-logic #peano-axioms
294
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Formal proof fitch-form

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#first-order-logic #formal-proofs
54
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Can you use constants from the domain in a First Order Formula?

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#logic #relations #first-order-logic

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