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Kees Doets's definitions of logical consequence

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#logic #first-order-logic #predicate-logic #model-theory #satisfiability
99
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Model Theory Question for Predicate Logic in van Dalen's Logic and Structure

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#discrete-mathematics #first-order-logic #predicate-logic #model-theory #computational-mathematics
96
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Switching constant places in Fitch proof

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65
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A problem in model theory: For each m and n indicate how to write down a sentence...

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166
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Question About Null Quantification Equivalences

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47
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$\forall x\in A(\in\mathcal P(E)),\,P(x)\Leftrightarrow\forall x\in E,\,(x\in A)\wedge P(x)$?

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#logic #predicate-logic #quantifiers
129
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Which logical rules are used in combining universal quantifiers with same conditional

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69
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Formulate a Graph with Predicate Logic

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47
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Math logic versus Semantic Web use of predicate

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#predicate-logic
104
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Should you avoid using the same variable name after existential elimination?

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264
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Disproving the statement $\alpha\rightarrow\beta\models\forall x.\alpha\rightarrow\forall x.\beta$

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516
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⊢∃(⟹∀) using Hilbert-style proof

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104
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A question on the diagonal lemma

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#logic #first-order-logic #predicate-logic #fixed-point-theorems
225
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Logically Necessary but NOT Tautologically necessary? Help

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#logic #propositional-calculus #first-order-logic #predicate-logic
202
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Simple Fitch Proof without using DeMorgan's Law

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#logic #solution-verification #proof-explanation #first-order-logic #predicate-logic

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