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-rw-r--r--doc/RefMan-tac.tex16
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diff --git a/doc/RefMan-tac.tex b/doc/RefMan-tac.tex
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--- a/doc/RefMan-tac.tex
+++ b/doc/RefMan-tac.tex
@@ -1186,6 +1186,22 @@ This tactic applies to a goal which have form {\tt t=u}
and transforms it into the two subgoals
{\tt t={\term}} and {\tt {\term}=u}.
+\subsection{\tt Subst {\ident}}\tacindex{Subst}
+This tactic applies to a goal which have \ident\ in its context and
+(at least) one hypothesis, say {\tt H}, of type {\tt
+ \ident=t}. Then it replaces
+\ident\ by {\tt t} everywhere in the goal (in the hypotheses
+and in the conclusion) and clears \ident\ and {\tt H} from the context.
+
+\Rem
+When several hypotheses have the form {\tt \ident=t}, the first one is used.
+
+\begin{Variants}
+ \item {\tt Subst \ident$_1$ \dots \ident$_n$} \\
+ Is equivalent to {\tt Subst \ident$_1$; \dots; Subst \ident$_n$}
+\end{Variants}
+
+
\section{Equality and inductive sets}
We describe in this section some special purpose
tactics dealing with equality and inductive sets or