Questions tagged [proof-review]

For questions that ask about possible improvements of a working piece of a proof. Make sure to also include the tag for the language used, and follow that tag's guidance regarding additional version-specific tags.

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Strong induction for nat in Coq

I'm doing some exercises on Coq and trying to prove the strong induction principle for nat: ...
2 votes
1 answer

Axiomization of Peano arithmetic in constructive first-order logic

I've been playing with axiomising systems of first-order logic in Coq. I've started to develop the beginning of a framework. As an example I give a minimal phrasing of Peano arithmetic in Coq in the ...
7 votes
1 answer

In Lean, contradiction tactic failed but actually goal accomplished

I've been playing with Lean, trying to prove the next lemma: lemma l1_cl (A B C : Prop) : ((A → B) → C) → ((A ∧ ¬ B) ∨ C) := ...
6 votes
2 answers

Problem proving a binary add function

I'm fairly new to the Coq language and I want to prove a function that does an binary add from numbers represented as a list (least significant bit upfront). I have created this badd function that ...
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6 votes
1 answer

Proof of symmetry of universe-polymorphic Leibniz equality in Agda

Consider the following definition of universe-polymorphic Leibniz equality: ...
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3 votes
1 answer

Code Review: Proving that a simple propositional logic satisfies Aristotle's Thesis

I'm proving that a simple propositional logic satisfies Aristotle's thesis. I'm curious how to improve the code in question. Here are the things I know that are wrong with it: I'm using ...
  • 2,593
5 votes
1 answer

How to implement first-order relational structures in Coq?

I'm trying to define a first-order relational structure in Coq. I have a way to define a pre-first-order-relational-structure, which is not a standard notion, but seems simple enough. I also have a ...
  • 2,593
4 votes
2 answers

Proof Review: Basic theorem about ternary relations in Coq

I'm proving a simple fact about ternary relations in Coq as an exercise. I'm interested in ternary relations at the moment because they are a simple thing that can represent a finitary consequence ...
  • 2,593
14 votes
1 answer

Proof review: Sum of nCk over antidiagonal = Fibonacci

Theorem to prove: The sum of the binomial coefficients over an antidiagonal is a Fibonacci number. More specifically, the $n$th antidiagonal sums to the $n+1$th Fibonacci number, where the ...
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