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Completeness of theory of infinite sets

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#logic #predicate-logic
55
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Order of quantifiers in this implication

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#logic #first-order-logic #predicate-logic #quantifiers
659
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Is $\forall x\exists y (p(x) \lor q(y)) \implies \exists y\forall x (p(x) \lor q(y))$ correct?

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What does two-sided turnstile means in logic?

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#logic #notation #predicate-logic
132
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Is "+" a two-place predicate?

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#logic #predicate-logic #foundations
70
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To what part of propositional grammar does "+" belong?

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#logic #predicate-logic #foundations
51
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Natural proof steps for predicate

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#predicate-logic #natural-deduction
132
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tricky question about substituting a logical variable

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#logic #first-order-logic #predicate-logic #quantifiers
84
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checking which of the propositions are logically true

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#discrete-mathematics #logic #first-order-logic #predicate-logic #quantifiers
74
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proving/disproving basic logical claims

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#discrete-mathematics #logic #predicate-logic #model-theory
38
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transferring to prenex(logic)

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#discrete-mathematics #logic #predicate-logic
46
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basic formalization using given languages

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#discrete-mathematics #logic #predicate-logic
24
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fixing a basic prenex form conversion (most of it is done)

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#discrete-mathematics #logic #predicate-logic
163
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Predicate formulas on the natural numbers using only $\le$.

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#predicate-logic #natural-numbers
223
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Verifying an answer to a question in predicate logic

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#logic #predicate-logic

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