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strip_imp                                                 (boolSyntax)
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strip_imp : term -> term list * term

SYNOPSIS
Iteratively breaks apart implications.

DESCRIBE
If {M} is of the form {t1 ==> (... (tn ==> t) ...)}, then {strip_imp M}
returns {([t1,...,tn],t)}. Note that

   strip_imp(list_mk_imp([t1,...,tn],t))

will not return {([t1,...,tn],t)} if {t} is an implication.

FAILURE
Never fails.

EXAMPLE

- strip_imp "(T ==> F) ==> (T ==> F)";;
> val it = (["T ==> F"; "T"], "F") : term list * term

- strip_imp (Term `t1 ==> t2 ==> t3 ==> ~t`);
> val it = ([`t1`, `t2`, `t3`, `t`], `F`) : term list * term




SEEALSO
boolSyntax.list_mk_imp, boolSyntax.dest_imp.

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