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What does this deduction involving provability imply?

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#logic #first-order-logic #incompleteness
173
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What is wrong with this deduction of $\text{ZF} \vdash \text{Cons ZF}$

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#logic #first-order-logic #incompleteness
113
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Is it possible to formalize $T \models \sigma$ within the deductive calculus?

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#logic #model-theory #first-order-logic #incompleteness
84
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How to find a formula that is true for a given model in the First Order Logic?

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#logic #proof-verification #problem-solving #first-order-logic
183
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Trying to understand self-reference as it relates to Godel's Second Incompleteness Theorem

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#logic #first-order-logic #incompleteness
170
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Example CNF for FOL

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#logic #first-order-logic
61
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Can't find a theory which meets conditions

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#logic #predicate-logic #first-order-logic
336
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Prove that if an existential formula A is satisfiable in a countable structure, then it's valid

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#logic #first-order-logic
824
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Extension of a theory vs conservative extension

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#logic #predicate-logic #first-order-logic
261
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Extending the language in Henkin style completeness proof for first-order logic

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#model-theory #first-order-logic
122
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Misunderstanding the concept of semantic consequence

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#logic #first-order-logic
151
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Is this formula in normal form prenex $(\forall x)(\exists y)(P(x) \land (\exists z)Q(y, z))$?

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#logic #first-order-logic
434
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Recursive definitions in formal logic

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#set-theory #first-order-logic #recursion #formal-proofs #formal-systems
1.8k
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Can we say in first order logic the following: Every person who loves everyone is good?

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#logic #first-order-logic
73
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Why does this mass equation not work in this calculus application problem?

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#calculus #ordinary-differential-equations #first-order-logic #applications

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