File: b.doc

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\DOC b

\TYPE {b : (void -> void)}

\SYNOPSIS
Restores the proof state undoing the effects of a previous expansion.

\DESCRIBE
The function {b} is part of the subgoal package. It is an abbreviation for the
function {backup}. For a description of the subgoal package, see
{set_goal}.

\FAILURE
As for {backup}.

\USES
Back tracking in a goal-directed proof to undo errors or try different tactics.

\SEEALSO
backup, backup_limit, e, expand, expandf, g, get_state, p, print_state, r,
rotate, save_top_thm, set_goal, set_state, top_goal, top_thm.

\ENDDOC