<xsl:template match = "m:apply[m:not[1]]">
<m:mrow>
<xsl:call-template name="insert_xref"/>
+<!-- CSC, per estetica!
<m:mo><xsl:call-template name="insert1"/>not</m:mo>
+-->
+ <m:mo><xsl:call-template name="insert1"/><m:mchar name="not"/></m:mo>
<xsl:apply-templates select = "*[2]" mode = "semantics">
<xsl:with-param name="IN_PREC" select="$FUNCTION_PREC"/>
</xsl:apply-templates>