- STRUCTURE
goalstackLib
- 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