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\DOC begin_proof
\TYPE {begin_proof : string -> void}
\KEYWORDS
proof recording.
\LIBRARY
record_proof
\SYNOPSIS
Begin recording a proof.
\DESCRIBE
A proof is a list of inference steps. The proof recorder records
every inference performed by the system in an internal buffer.
When a proof is completed, the raw records are converted into a list
of proof lines as in Hilbert's style proofs. These lines are then
output to a disk file. This file is in the {prf} format specified in
[1]. A proof file may contain one or more of proofs.
The function {begin_proof} starts the proof recorder. All inferences
performed by the system will be recorded until the function
{end_proof} is called. It stores the proof into the current proof
file. The argument to {begin_proof} is the name of the proof which will be
written into the proof file.
The {begin_proof} and {end_proof} pair provides a simple user
interface for recording forward proofs.
For tactical proofs, use the functions {TAC_PROOF}, {PROVE},
{prove} and {prove_thm}. They will save the proof in the current proof
file automatically.
\FAILURE
Fails if a proof starts by {begin_proof} has not been terminated by {end_proof}.
\EXAMPLE
Below is an example showing the use of this function to record a simple
proof:
{
#new_proof_file `myproof`;;
() : void
#let th = SPEC_ALL ADD_SYM;;
Theorem ADD_SYM autoloading from theory `arithmetic` ...
ADD_SYM = |- !m n. m + n = n + m
th = |- m + n = n + m
#let v = genvar ":num";;
"GEN%VAR%536" : term
#begin_proof`proof1`;;
() : void
#let th1 = (REFL "SUC(m + n)");;
th1 = |- SUC(m + n) = SUC(m + n)
#let th2 = SUBST [th,v] "SUC(m + n) = SUC ^v" th1;;
th2 = |- SUC(m + n) = SUC(n + m)
#end_proof();;
() : void
}
\SEEALSO
current_proof, current_proof_file,
new_proof_file, close_proof_file, begin_proof, end_proof,
TAC_PROOF, PROVE, prove, prove_thm
\ENDDOC
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