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15
Math.TechQA.Club
2019-02-22 18:37:28
365
Views
Fitch proof for a=b
Published on
22 Feb 2019 - 18:37
#logic
#first-order-logic
49
Views
Semantics For Quantifiers
Published on
23 Feb 2019 - 20:23
#logic
#first-order-logic
1.1k
Views
Proving that $\{NAND\}$ and $\{NOR\}$ each is the only minimal functionally complete set of logical connectives with 1 element
Published on
24 Feb 2019 - 7:19
#logic
#first-order-logic
68
Views
Counterexample for the invalidity of the following
Published on
25 Mar 2026 - 10:55
#examples-counterexamples
#first-order-logic
#predicate-logic
#natural-deduction
63
Views
Proof using natural deduction of $\small\forall x~[A(x)\to\exists y~[B(y)\land C(y,x)]] \vdash\forall x~[\exists y~[A(x)\to(B(y)\land C(y,x))]]$
Published on
25 Mar 2026 - 10:58
#first-order-logic
#predicate-logic
#natural-deduction
323
Views
How to prove conditional in Coq?
Published on
25 Feb 2019 - 3:23
#discrete-mathematics
#logic
#first-order-logic
2k
Views
How can equality be defined in first-order logic?
Published on
25 Feb 2019 - 4:29
#logic
#first-order-logic
82
Views
Theorem for some structure that it cannot be axiomatized in any language?
Published on
25 Mar 2026 - 6:02
#logic
#first-order-logic
#incompleteness
373
Views
What is the standard first-order language to formalize ZFC?
Published on
27 Mar 2026 - 11:46
#set-theory
#first-order-logic
#predicate-logic
212
Views
Show that $∀x∃yRxy ⊢ ∃zRf(a)z$
Published on
26 Mar 2026 - 23:09
#logic
#first-order-logic
#predicate-logic
#quantifiers
175
Views
Can all relations be defined from symmetric relations?
Published on
26 Mar 2026 - 20:38
#logic
#first-order-logic
#model-theory
181
Views
Can every relation be defined from "set-ary" relations?
Published on
26 Mar 2026 - 20:38
#logic
#relations
#first-order-logic
#model-theory
56
Views
Q: on Lemma I.5.11 proof from Tourlakis 2003
Published on
26 Mar 2026 - 20:40
#logic
#first-order-logic
#predicate-logic
#model-theory
340
Views
A theorem similar to Los-Tarski
Published on
26 Mar 2026 - 20:39
#logic
#first-order-logic
#model-theory
169
Views
Why can't the sequent calculus for First-Order Classical Logic be used for proving decidability via Proof-search?
Published on
23 Feb 2026 - 2:56
#first-order-logic
#proof-theory
#decidability
#sequent-calculus
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