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\DOC THEN_TCL
\TYPE {(THEN_TCL) : thm_tactical -> thm_tactical -> thm_tactical}
\SYNOPSIS
Composes two theorem-tacticals.
\KEYWORDS
theorem-tactical.
\DESCRIBE
If {ttl1} and {ttl2} are two theorem-tacticals, {ttl1 THEN_TCL ttl2} is
a theorem-tactical which composes their effect; that is, if:
{
ttl1 ttac th1 = ttac th2
}
\noindent and
{
ttl2 ttac th2 = ttac th3
}
\noindent then
{
(ttl1 THEN_TCL ttl2) ttac th1 = ttac th3
}
\FAILURE
The application of {THEN_TCL} to a pair of theorem-tacticals never fails.
\SEEALSO
EVERY_TCL, FIRST_TCL, ORELSE_TCL.
\ENDDOC
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