X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fhelp%2FC%2Fsec_tactics.xml;h=e03dece5bc1bd8ea612d0b4fdfe4153b66d9d899;hb=ccf5bef29f42897a28ee7cc797c3d5698adfcb1d;hp=ff8d099c0180101efba481ec0f7cd16ed0308ace;hpb=76917216be769918258c90e486bb7c06d81b70b4;p=helm.git

diff --git a/matita/help/C/sec_tactics.xml b/matita/help/C/sec_tactics.xml
index ff8d099c0..e03dece5b 100644
--- a/matita/help/C/sec_tactics.xml
+++ b/matita/help/C/sec_tactics.xml
@@ -215,6 +215,52 @@
       </variablelist>
     </para>
   </sect1>
+  <sect1 id="tac_cases">
+    <title>cases</title>
+    <titleabbrev>cases</titleabbrev>
+    <para><userinput>
+     cases t hyps
+    </userinput></para>
+    <para>
+      <variablelist>
+        <varlistentry role="tactic.synopsis">
+          <term>Synopsis:</term>
+          <listitem>
+            <para>
+	     <emphasis role="bold">cases</emphasis>
+	     &term; [<emphasis role="bold">(</emphasis>[&id;]…<emphasis role="bold">)</emphasis>]
+	    </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>Pre-conditions:</term>
+          <listitem>
+            <para>
+	     <command>t</command> must inhabit an inductive type
+	    </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>Action:</term>
+          <listitem>
+            <para>
+	     It proceed by cases on <command>t</command>. The new generated
+             hypothesis in each branch are named according to
+             <command>hyps</command>.
+	    </para>
+          </listitem>
+        </varlistentry>
+        <varlistentry>
+          <term>New sequents to prove:</term>
+          <listitem>
+            <para>One new sequent for each constructor of the type of
+             <command>t</command>. Each sequent has a new hypothesis for
+             each argument of the constructor.</para>
+          </listitem>
+        </varlistentry>
+      </variablelist>
+    </para>
+  </sect1>
   <sect1 id="tac_clear">
     <title>clear</title>
     <titleabbrev>clear</titleabbrev>
@@ -450,8 +496,7 @@
     <title>decompose</title>
     <titleabbrev>decompose</titleabbrev>
     <para><userinput>
-     decompose (T<subscript>1</subscript> ... T<subscript>n</subscript>) 
-     H as H<subscript>1</subscript> ... H<subscript>m</subscript>
+     decompose as H<subscript>1</subscript> ... H<subscript>m</subscript>
     </userinput></para>
     <para>
       <variablelist>
@@ -460,10 +505,6 @@
           <listitem>
             <para>
 	     <emphasis role="bold">decompose</emphasis>
-	     [<emphasis role="bold">(</emphasis>
-	     &id;…
-	     <emphasis role="bold">)</emphasis>]
-	     [&id;] 
 	     [<emphasis role="bold">as</emphasis> &id;…]
 	    </para>
           </listitem>
@@ -471,26 +512,22 @@
         <varlistentry>
           <term>Pre-conditions:</term>
           <listitem>
-            <para> 
-	     <command>H</command> must inhabit one inductive type among  
-	     <command>
-	      T<subscript>1</subscript> ... T<subscript>n</subscript>
-	     </command>
-	     and the types of a predefined list.
-	    </para>
+            <para>None.</para>
           </listitem>
         </varlistentry>
         <varlistentry>
           <term>Action:</term>
           <listitem>
             <para>
-	     Runs <command>
-	      elim H H<subscript>1</subscript> ... H<subscript>m</subscript>
-	     </command>, clears <command>H</command> and tries to run itself
-	     recursively on each new identifier introduced by 
+	     For each each premise <command>H</command> of type 
+	     <command>T</command> in the current context where
+	     <command>T</command> is a non-recursive inductive type without
+	     right parameters and of sort Prop or CProp, the tactic runs
+	     <command> 
+	      elim H as H<subscript>1</subscript> ... H<subscript>m</subscript>
+	     </command>, clears <command>H</command>  and runs itself
+	     recursively on each new premise introduced by 
 	     <command>elim</command> in the opened sequents. 
-	     If <command>H</command> is not provided tries this operation on
-	     each premise in the current context.
 	    </para>
           </listitem>
         </varlistentry>