PrimitiveTactics: intros _ now aveilable

[helm.git] / matita / help / C / sec_tactics.xml

diff --git a/matita/help/C/sec_tactics.xml b/matita/help/C/sec_tactics.xml
index ff8d099c0180101efba481ec0f7cd16ed0308ace..e03dece5bc1bd8ea612d0b4fdfe4153b66d9d899 100644 (file)
--- 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>