doc-src/TutorialI/Rules/find2.thy

--- a/doc-src/TutorialI/Rules/find2.thy	Fri Jun 24 04:18:48 2005 +0200
+++ b/doc-src/TutorialI/Rules/find2.thy	Fri Jun 24 13:22:08 2005 +0200
@@ -4,19 +4,19 @@
 (*>*)
 
 txt{*\index{finding theorems}\index{searching theorems} In
-\S\ref{sec:find} we introduced Proof General's \pgmenu{Find} button
+\S\ref{sec:find}, we introduced Proof General's \pgmenu{Find} button
 for finding theorems in the database via pattern matching. If we are
-inside a proof we can be more specific and search for introduction,
-elimination and destruction rules \emph{w.r.t.\ the current goal}.
-For this purpose \pgmenu{Find} provides 3 aditional search criteria:
+inside a proof, we can be more specific; we can search for introduction,
+elimination and destruction rules \emph{with respect to the current goal}.
+For this purpose, \pgmenu{Find} provides three aditional search criteria:
 \texttt{intro}, \texttt{elim} and \texttt{dest}.
 
 For example, given the goal @{subgoals[display,indent=0,margin=65]}
-when you click on \pgmenu{Find} and type in the search expression
-\texttt{intro} you are shown a few rules ending in @{text"\<Longrightarrow> ?P \<and> ?Q"},
-among them @{thm[source]conjI}. This can be very effective for finding
-if the very theorem you are trying to prove is already in the
-database: given the goal *}
+you can click on \pgmenu{Find} and type in the search expression
+\texttt{intro}. You will be shown a few rules ending in @{text"\<Longrightarrow> ?P \<and> ?Q"},
+among them @{thm[source]conjI}\@. You may even discover that
+the very theorem you are trying to prove is already in the
+database.  Given the goal *}
 (*<*)
 oops
 lemma "A \<longrightarrow> A"
@@ -31,7 +31,7 @@
 "_ \at\ _"  intro
 \end{ttbox}
 searches for all introduction rules that match the current goal and
-contain the @{text"@"} function.
+mention the @{text"@"} function.
 
 Searching for elimination and destruction rules via \texttt{elim} and
 \texttt{dest} is analogous to \texttt{intro} but takes the assumptions