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<b>let </b><font color="Maroon">p</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="polyalg1.html#K1" target="_self">Formal-Series</a> <font color="Maroon">L</font></span>)</span>, <font color="Maroon">q</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="polyalg1.html#K1" target="_self">Formal-Series</a> <font color="Maroon">L</font></span>)</span>; <i><font color="Red">:: according to </font></i><a class="ref" href="group_1.html#D16">GROUP_1:def 16</a><br/>

<b>reconsider </b><font color="Maroon">p1</font> = <font color="Maroon">p</font>, <font color="Maroon">q1</font> = <font color="Maroon">q</font> as   <a href="normsp_1.html#NM2">sequence</a> of <font color="Maroon">L</font> <b>by </b><i/>;<br/>
<b>thus </b><font color="Maroon">p</font> <a href="group_1.html#K1">*</a> <font color="Maroon">q</font> = 
<font color="Maroon">p1</font> <a href="polynom3.html#K15">*'</a> <font color="Maroon">q1</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">q</font> <a href="group_1.html#K1">*</a> <font color="Maroon">p</font>
<b>by </b><i/>
;<br/>


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