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<b>let </b><font color="Maroon" title="c1">G</font> be  <a href="group_1.html#V1" title="GROUP_1:attr.1">strict</a> <a href="group_1.html#NM1" title="GROUP_1:NM.1">Group</a>;<br/><b>let </b><font color="Maroon" title="c2">H</font>, <font color="Maroon" title="c3">F1</font>, <font color="Maroon" title="c4">F2</font> be  <a href="group_1.html#V1" title="GROUP_1:attr.1">strict</a>  <a href="group_2.html#M1" title="GROUP_2:mode.1">Subgroup</a> of <font color="Maroon" title="c1">G</font>;<br/>



<b>assume </b><a NAME="E1:3"/><i><font color="Green" title="E3">A1</font></i>: 
<font color="Maroon" title="c3">F1</font> is  <a href="group_3.html#V1" title="GROUP_3:attr.1">normal</a>  <a href="group_6.html#M1" title="GROUP_6:mode.1">Subgroup</a> of <font color="Maroon" title="c4">F2</font>
 ;<br/>

<b>then </b><i><font color="Green" title="E4">A2</font></i>: <font color="Maroon" title="c3">F1</font> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <font color="Maroon" title="c2">H</font> = 
<span class="p1">(<span class="default"><font color="Maroon" title="c3">F1</font> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <font color="Maroon" title="c4">F2</font></span>)</span> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <font color="Maroon" title="c2">H</font>
<b>by </b><i><a class="ref" href="group_2.html#T107" title="GROUP_2:th.107">GROUP_2:107</a></i>
<br/>.= 
<font color="Maroon" title="c3">F1</font> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <span class="p1">(<span class="default"><font color="Maroon" title="c4">F2</font> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <font color="Maroon" title="c2">H</font></span>)</span>
<b>by </b><i><a class="ref" href="group_2.html#T102" title="GROUP_2:th.102">GROUP_2:102</a></i>
;<br/>
<b>reconsider </b><font color="Maroon" title="c5">F1</font> = <font color="Maroon" title="c3">F1</font> as  <a href="group_3.html#V1" title="GROUP_3:attr.1">normal</a>  <a href="group_6.html#M1" title="GROUP_6:mode.1">Subgroup</a> of <font color="Maroon" title="c4">F2</font> <b>by </b><i><a class="txt" href="grsolv_1.html#E1:3"><i><font color="Green" title="E3">A1</font></i></a></i>;<br/>
<b>reconsider </b><font color="Maroon" title="c6">F</font> = <font color="Maroon" title="c4">F2</font> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <font color="Maroon" title="c2">H</font> as    <a href="group_6.html#M1" title="GROUP_6:mode.1">Subgroup</a> of <font color="Maroon" title="c4">F2</font> <b>by </b><i><a class="ref" href="group_2.html#T106" title="GROUP_2:th.106">GROUP_2:106</a></i>;<br/>
<a NAME="E5:3"/>
<font color="Maroon" title="c5">F1</font> <a href="group_6.html#K3" title="GROUP_6:func.3">/\</a> <font color="Maroon" title="c6">F</font> is  <a href="group_3.html#V1" title="GROUP_3:attr.1">normal</a>  <a href="group_6.html#M1" title="GROUP_6:mode.1">Subgroup</a> of <font color="Maroon" title="c6">F</font>
 
;<br/>
<b>hence </b><a NAME="E6:3"/>
<font color="Maroon" title="c3">F1</font> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <font color="Maroon" title="c2">H</font> is  <a href="group_3.html#V1" title="GROUP_3:attr.1">normal</a>  <a href="group_6.html#M1" title="GROUP_6:mode.1">Subgroup</a> of <font color="Maroon" title="c4">F2</font> <a href="group_2.html#K9" title="GROUP_2:func.9">/\</a> <font color="Maroon" title="c2">H</font>
 <b>by </b><i><a class="txt" href="grsolv_1.html#E2:3"><i><font color="Green" title="E4">A2</font></i></a>, <a class="ref" href="group_6.html#T3" title="GROUP_6:th.3">GROUP_6:3</a></i>;<br/>


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