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<b>let </b><font color="Maroon" title="c2">M1</font>, <font color="Maroon" title="c3">M2</font> be  <a href="card_1.html#V1" title="CARD_1:attr.1">cardinal</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ;<br/>

<b>assume </b><a NAME="E1:6_1_2"/>
( ( for <font color="Olive" title="b1">x</font> being  <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font> holds   <a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Olive" title="b1">x</font>,<font color="Maroon" title="c1">T</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Maroon" title="c2">M1</font> ) &amp; ( for <font color="Olive" title="b1">M</font> being <a href="card_1.html#V1" title="CARD_1:attr.1">cardinal</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a>   st ( for <font color="Olive" title="b2">x</font> being  <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font> holds   <a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Olive" title="b2">x</font>,<font color="Maroon" title="c1">T</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Olive" title="b1">M</font> ) holds <br/><font color="Maroon" title="c2">M1</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Olive" title="b1">M</font> ) &amp; ( for <font color="Olive" title="b1">x</font> being  <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font> holds   <a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Olive" title="b1">x</font>,<font color="Maroon" title="c1">T</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Maroon" title="c3">M2</font> ) &amp; ( for <font color="Olive" title="b1">M</font> being <a href="card_1.html#V1" title="CARD_1:attr.1">cardinal</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a>   st ( for <font color="Olive" title="b2">x</font> being  <a href="pre_topc.html#NM2" title="PRE_TOPC:NM.2">Point</a> of <font color="Maroon" title="c1">T</font> holds   <a href="topgen_2.html#K1" title="TOPGEN_2:func.1">Chi</a> <font color="Olive" title="b2">x</font>,<font color="Maroon" title="c1">T</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Olive" title="b1">M</font> ) holds <br/><font color="Maroon" title="c3">M2</font> <a href="card_1.html#NR1" title="CARD_1:NR.1">&lt;=`</a> <font color="Olive" title="b1">M</font> ) )
 ;<br/>

<b>hence </b><a NAME="E2:6_1_2"/>
( <font color="Maroon" title="c2">M1</font> <a href="ordinal1.html#R1" title="ORDINAL1:pred.1">c=</a> <font color="Maroon" title="c3">M2</font> &amp; <font color="Maroon" title="c3">M2</font> <a href="ordinal1.html#R1" title="ORDINAL1:pred.1">c=</a> <font color="Maroon" title="c2">M1</font> )
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D10" title="XBOOLE_0:def.10">XBOOLE_0:def 10</a><br/>


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