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<b>let </b><font color="Maroon">R</font> be  <a href="group_1.html#V7">commutative</a> <a href="funcsdom.html#NM1">Ring</a>;<br/><b>let </b><font color="Maroon">I</font> be   <a href="ideal_1.html#NM1">Ideal</a> of <font color="Maroon">R</font>;<br/>



<b>thus </b><a NAME="E1:40"/>
( <font color="Maroon">I</font> is <a href="ring_1.html#V4" target="_self">maximal</a> implies <font color="Maroon">R</font> <a href="ring_1.html#NK3" target="_self">/</a> <font color="Maroon">I</font> is   <a href="vectsp_2.html#NM3">Skew-Field</a> )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="40_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:40_1"/>
<font color="Maroon">I</font> is <a href="ring_1.html#V4" target="_self">maximal</a>
 ;<br/>

<a NAME="E2:40_1"/><b>then </b>
( <font color="Maroon">I</font> is <a href="ring_1.html#V3" target="_self">quasi-maximal</a> &amp; <font color="Maroon">I</font> is <a href="ideal_1.html#V5">proper</a> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:40_1"/>
<font color="Maroon">R</font> <a href="ring_1.html#NK3" target="_self">/</a> <font color="Maroon">I</font> is   <a href="vectsp_2.html#NM3">Skew-Field</a>
 <b>by </b><i>, </i>;<br/>


</div><b>end;</b></div>

<b>assume </b><a NAME="E2:40"/>
<font color="Maroon">R</font> <a href="ring_1.html#NK3" target="_self">/</a> <font color="Maroon">I</font> is   <a href="vectsp_2.html#NM3">Skew-Field</a>
 ;<br/>

<b>hence </b><a NAME="E3:40"/>
( <font color="Maroon">I</font> is <a href="ideal_1.html#V5">proper</a> &amp; <font color="Maroon">I</font> is <a href="ring_1.html#V3" target="_self">quasi-maximal</a> )
 <b>by </b><i>, <a class="ref" href="ring_1.html#T1" target="_self">Th1</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="ring_1.html#D4" target="_self">RING_1:def 4</a><br/>


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