Unified: refactoring

[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..aa9610df0aa83e22c517da9782111274710a0d56 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>