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Why not ban nested quantifiers over the same variable?

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#logic #first-order-logic #predicate-logic #natural-deduction
70
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First-order logic mindset when checking if A fulfills B

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#examples-counterexamples #first-order-logic #natural-deduction
157
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Formal definitions in natural deduction

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#logic #natural-deduction
366
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Predicate logic, proof of validity of sequent.

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#logic #first-order-logic #predicate-logic #natural-deduction #formal-proofs
2.3k
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Predicate Logic, Proof of validity . How to remove negation infront of existential quantifier?

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Proving the distributive law with natural deduction

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1.1k
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Logical disjunction elimination rule

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#logic #propositional-calculus #natural-deduction
64
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Natural Deduction Problem formula

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#combinatorics #logic #propositional-calculus #natural-deduction
563
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$(P → Q) \lor (Q → R)$, Fitch-style proof

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#logic #propositional-calculus #natural-deduction #formal-proofs
206
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What is the utility, exactly, of the Deduction Theorem?

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#logic #proof-explanation #propositional-calculus #natural-deduction
391
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Hilbert systems and natural deduction systems in terms of "context"

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#logic #definition #natural-deduction #sequent-calculus #hilbert-calculus
657
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Does natural deduction require a non-empty set of premises?

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#logic #definition #propositional-calculus #proof-theory #natural-deduction
513
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Fitch system, or alternatives?

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#logic #proof-writing #definition #natural-deduction #online-resources
420
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Natural deduction proof for $(a\to(b\to c))\to((a\to b)\to(a\to c))$

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#logic #proof-writing #propositional-calculus #natural-deduction
900
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Showing validity of an argument when premises contradict each other (natural deduction)

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#logic #natural-deduction

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