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15
Math.TechQA.Club
2026-03-25 18:45:14
434
Views
What is the difference between "Peano arithmetic," "second-order arithmetic," and "second-order Peano arithmetic?"
Published on
25 Mar 2026 - 18:45
#logic
#axioms
#foundations
#peano-axioms
#reverse-math
55
Views
Peano axioms and Induction to prove $s(x) \cdot y = x \cdot y + y$
Published on
28 Nov 2021 - 14:11
#induction
#peano-axioms
160
Views
Satisfaction of Peano postulates in topos with natural numbers object
Published on
11 Dec 2021 - 17:04
#peano-axioms
#topos-theory
84
Views
How can I encode a proof in PA as a godel number?
Published on
26 Mar 2026 - 17:31
#logic
#peano-axioms
#provability
92
Views
How to prove non-equality using Peano axioms?
Published on
20 Dec 2021 - 1:35
#logic
#first-order-logic
#predicate-logic
#peano-axioms
58
Views
Soundness for first order
Published on
26 Dec 2021 - 0:44
#logic
#first-order-logic
#peano-axioms
86
Views
Interesting examples of first-order, one-sorted proper extensions of PA
Published on
05 Jan 2022 - 2:22
#logic
#first-order-logic
#axioms
#natural-numbers
#peano-axioms
92
Views
Peano axioms without identity and function symbols
Published on
12 Jan 2022 - 23:51
#logic
#first-order-logic
#relations
#predicate-logic
#peano-axioms
66
Views
Gentzen's consistency proof of PA
Published on
13 Jan 2022 - 9:29
#logic
#reference-request
#peano-axioms
234
Views
(Request for) simple constructive proof of existence of nonstandard model of PA
Published on
25 Mar 2026 - 17:20
#logic
#alternative-proof
#peano-axioms
#nonstandard-models
110
Views
How exactly are you allowed to use free set/predicate variables in first-order arithmetic?
Published on
19 Jan 2022 - 7:01
#first-order-logic
#predicate-logic
#proof-theory
#peano-axioms
201
Views
Formal induction over two variables
Published on
29 Jan 2022 - 23:02
#logic
#induction
#first-order-logic
#peano-axioms
181
Views
Halmos's set theory If $E$ is a non-empty set of natural numbers, exists some $k$ in $E$ such that $k \leqq m$ for all $m\in E$. Prove by intersection
Published on
01 Feb 2022 - 18:09
#set-theory
#natural-numbers
#peano-axioms
58
Views
How can I proove only one of these three holds? $m>n, m=n, m<n$.
Published on
03 Feb 2022 - 21:14
#inequality
#peano-axioms
75
Views
Are there any arithmetic statements where there does not exist a proof proving the statement?
Published on
29 Mar 2026 - 10:46
#peano-axioms
#incompleteness
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