--- /dev/null
+<?xml version="1.0"?>
+
+<!-- Copyright (C) 2000, HELM Team -->
+<!-- -->
+<!-- This file is part of HELM, an Hypertextual, Electronic -->
+<!-- Library of Mathematics, developed at the Computer Science -->
+<!-- Department, University of Bologna, Italy. -->
+<!-- -->
+<!-- HELM is free software; you can redistribute it and/or -->
+<!-- modify it under the terms of the GNU General Public License -->
+<!-- as published by the Free Software Foundation; either version 2 -->
+<!-- of the License, or (at your option) any later version. -->
+<!-- -->
+<!-- HELM is distributed in the hope that it will be useful, -->
+<!-- but WITHOUT ANY WARRANTY; without even the implied warranty of -->
+<!-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -->
+<!-- GNU General Public License for more details. -->
+<!-- -->
+<!-- You should have received a copy of the GNU General Public License -->
+<!-- along with HELM; if not, write to the Free Software -->
+<!-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, -->
+<!-- MA 02111-1307, USA. -->
+<!-- -->
+<!-- For details, see the HELM World-Wide-Web page, -->
+<!-- http://cs.unibo.it/helm/. -->
+
+<!--******************************************************************-->
+<!-- Arithmetics -->
+<!-- First draft: March 20 2001, Ferruccio Guidi -->
+<!-- Zarith: July 2001, Andrea Asperti -->
+<!--******************************************************************-->
+
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+ xmlns:m="http://www.w3.org/1998/Math/MathML"
+ xmlns:helm="http://www.cs.unibo.it/helm">
+
+<!-- ************************** ARITHMETICS ****************************** -->
+
+<!-- S and O -->
+<xsl:template match="APPLY[*[position()=1 and name()='MUTCONSTRUCT' and @uri='cic:/Coq/Init/Datatypes/nat.ind' and @noConstr='2'] and count(*)=2]" mode="pure">
+ <xsl:apply-templates select="*[2]" mode="succ">
+ <xsl:with-param name="n" select="1"/>
+ <xsl:with-param name="iden" select="@id"/>
+ </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="*" mode="succ">
+ <xsl:param name="n" select="0"/>
+ <xsl:param name="iden" select="''"/>
+ <xsl:choose>
+ <xsl:when test="name()='APPLY' and *[position()=1 and name()='MUTCONSTRUCT'
+and @uri='cic:/Coq/Init/Datatypes/nat.ind' and @noConstr='2']">
+ <xsl:apply-templates select="*[2]" mode="succ">
+ <xsl:with-param name="n" select="$n +1"/>
+ <xsl:with-param name="iden" select="$iden"/>
+ </xsl:apply-templates>
+ </xsl:when>
+ <xsl:when test="name()='MUTCONSTRUCT' and @uri='cic:/Coq/Init/Datatypes/nat.ind' and @noConstr='1'">
+ <m:cn helm:xref="{$iden}"><xsl:value-of select="$n"/></m:cn>
+ </xsl:when>
+ <xsl:otherwise>
+ <m:apply helm:xref="{$iden}">
+ <m:plus/>
+ <m:cn><xsl:value-of select="$n"/></m:cn>
+ <xsl:apply-templates select="." mode="pure"/>
+ </m:apply>
+ </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
+
+<!-- **************************** Zarith ******************************** -->
+
+
+
+<xsl:template match="APPLY[*[position()=1 and name()='MUTCONSTRUCT' and @uri='cic:/Coq/ZArith/fast_integer/fast_integers/Z.ind' and @noConstr='2'] and count(*)=2]" mode="pure">
+ <xsl:apply-templates select="*[2]" mode="Zpositive">
+ <xsl:with-param name="base" select="0"/>
+ <xsl:with-param name="exp" select="1"/>
+ <xsl:with-param name="iden" select="*[2]/@id"/>
+ </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="APPLY[*[position()=1 and name()='MUTCONSTRUCT' and @uri='cic:/Coq/ZArith/fast_integer/fast_integers/Z.ind' and @noConstr='3'] and count(*)=2]" mode="pure">
+ <m:apply helm:xref="{@id}">
+ <m:minus definitionURL="{*[1]/@uri}" helm:xref="{*[1]/@id}"/>
+ <xsl:apply-templates select="*[2]" mode="Zpositive">
+ <xsl:with-param name="base" select="0"/>
+ <xsl:with-param name="exp" select="1"/>
+ <xsl:with-param name="iden" select="*[2]/@id"/>
+ </xsl:apply-templates>
+ </m:apply>
+</xsl:template>
+
+<xsl:template match="MUTCONSTRUCT[@uri='cic:/Coq/ZArith/fast_integer/fast_integers/Z.ind' and @noConstr='1']" mode="pure">
+ <m:ci definitionURL="{@uri}" helm:xref="{@id}">0</m:ci>
+</xsl:template>
+
+<!-- prova di notazione per positive -->
+
+<xsl:template match="APPLY[*[position()=1 and name()='MUTCONSTRUCT' and @uri='cic:/Coq/ZArith/fast_integer/fast_integers/positive.ind']]" mode="pure">
+ <xsl:apply-templates select="." mode="Zpositive">
+ <xsl:with-param name="base" select="0"/>
+ <xsl:with-param name="exp" select="1"/>
+ <xsl:with-param name="iden" select="@id"/>
+ </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="MUTCONSTRUCT[@uri='cic:/Coq/ZArith/fast_integer/fast_integers/positive.ind' and @noConstr='3']" mode="pure">
+ <m:ci definitionURL="{@uri}" helm:xref="{@id}">1</m:ci>
+</xsl:template>
+
+<xsl:template match="*" mode="Zpositive">
+ <xsl:param name="base" select="0"/>
+ <xsl:param name="exp" select="1"/>
+ <xsl:param name="iden" select="''"/>
+ <xsl:choose>
+ <xsl:when test="name()='APPLY' and *[position()=1 and name()='MUTCONSTRUCT'
+and @uri='cic:/Coq/ZArith/fast_integer/fast_integers/positive.ind' and @noConstr='1']">
+ <xsl:apply-templates select="*[2]" mode="Zpositive">
+ <xsl:with-param name="base" select="$base + $exp"/>
+ <xsl:with-param name="exp" select="2 * $exp"/>
+ <xsl:with-param name="iden" select="$iden"/>
+ </xsl:apply-templates>
+ </xsl:when>
+ <xsl:when test="name()='APPLY' and *[position()=1 and name()='MUTCONSTRUCT'
+and @uri='cic:/Coq/ZArith/fast_integer/fast_integers/positive.ind' and @noConstr='2']">
+ <xsl:apply-templates select="*[2]" mode="Zpositive">
+ <xsl:with-param name="base" select="$base"/>
+ <xsl:with-param name="exp" select="2 * $exp"/>
+ <xsl:with-param name="iden" select="$iden"/>
+ </xsl:apply-templates>
+ </xsl:when>
+ <xsl:when test="name()='MUTCONSTRUCT' and @uri='cic:/Coq/ZArith/fast_integer/fast_integers/positive.ind' and @noConstr='3'">
+ <m:ci helm:xref="{$iden}"><xsl:value-of select="$base + $exp"/></m:ci>
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:choose>
+ <xsl:when test="$base = 0">
+ <xsl:choose>
+ <xsl:when test="$exp = 1">
+ <xsl:apply-templates select="." mode="pure"/>
+ </xsl:when>
+ <xsl:otherwise>
+ <m:apply helm:xref="{$iden}">
+ <m:times/>
+ <m:ci><xsl:value-of select="$exp"/></m:ci>
+ <xsl:apply-templates select="." mode="pure"/>
+ </m:apply>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:when>
+ <xsl:otherwise>
+ <m:apply helm:xref="{$iden}">
+ <m:plus/>
+ <m:ci><xsl:value-of select="$base"/></m:ci>
+ <xsl:choose>
+ <xsl:when test="$exp = 1">
+ <xsl:apply-templates select="." mode="pure"/>
+ </xsl:when>
+ <xsl:otherwise>
+ <m:apply helm:xref="{$iden}">
+ <m:times/>
+ <m:ci><xsl:value-of select="$exp"/></m:ci>
+ <xsl:apply-templates select="." mode="pure"/>
+ </m:apply>
+ </xsl:otherwise>
+ </xsl:choose>
+ </m:apply>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
+
+</xsl:stylesheet>
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