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<div>:: <span class="kw">deftheorem </span><span class="lab"><font color="Green" title="E3">Def2</font></span>   defines <a href="ordinal1.html#V8" title="ORDINAL1:attr.8">zero</a> <a onclick="hs(this)" href="javascript:()">CHAIN_1:def 2 : <br/></a><span> for <font color="Olive" title="b1">d</font> being   <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a> holds <br/> ( <font color="Olive" title="b1">d</font> is  <a href="ordinal1.html#V8" title="ORDINAL1:attr.8">zero</a>  iff  not <font color="Olive" title="b1">d</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> 1 );<br/></span></div>
