Questions tagged [forward-proof]

Forward proofs are the most common proof type. First, you state what you want to prove as a claim. Then, you begin to derive facts that you can use. As you go, write each key fact in a fact bank, which is just a place for you to collect known facts. At each step of the proof, consult the fact bank to see whether any of those facts are useful.

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How to write a low-level proof in Isar?

I would like to formalize ...
Gergely's user avatar
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1 vote
1 answer
131 views

How do I prove a record related lemma?

I'm new to coq. I would appreciate it if you could help me. Consider the following definition: Record person:= mk_person { p_name : t1; p_age : t2}. How to prove ...
B.Rolando's user avatar
8 votes
1 answer
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Is there an elegant way of proving an equality A=B by going in both directions?

I would like to prove an equality by splitting it into a proof in each direction. Is there a more elegant style to start such a proof than this way:: ...
Mark Utting's user avatar
8 votes
2 answers
192 views

How to prove Gauss summation of integers with proof assistants using forward reasoning?

As shown in an exercise here, we can prove the Gauss summation (that $\Sigma_{i=0..n}{i} = n \cdot (n + 1)/2$ ) in Isabelle/Isar using mathematical induction, as follows. ...
tinlyx's user avatar
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9 votes
0 answers
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Has there been any work on automated translation of tactic proofs to everyday language?

There are times when I've completed a proof with a lot of backwards reasoning, and I've kind of lost the thread of what I've actually done. It would be nice if there was something that could ...
march's user avatar
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15 votes
3 answers
278 views

Proof assistants for forward reasoning?

I have only very limited learning experience with Isabelle and Coq. An issue while learning to use proof assistants is that forward proof is cumbersome or difficult. For example, the first time I saw ...
tinlyx's user avatar
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