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<a NAME="E1:31_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="glib_000.html#K15" target="_self">.order()</a>  <a href="hidden.html#R1">=</a>  <a href="card_1.html#K4">card</a> <span class="p1">(<span class="default"><a href="glib_000.html#K6" target="_self">the_Vertices_of</a> <font color="Maroon">c<sub>1</sub></font></span>)</span>
 
;<br/>
<b>hence </b><a NAME="E2:31_1_1"/>
<font color="Maroon">c<sub>1</sub></font> <a href="glib_000.html#K15" target="_self">.order()</a>  is  non <a href="xboole_0.html#V1">empty</a> <a href="nat_1.html#NM1">Nat</a>
 <b>by </b><i><a class="ref" href="card_2.html#T59">CARD_2:59</a></i>;<br/>


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