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<div><span class="kw">theorem </span><a NAME="T19"><span class="comment"><font color="firebrick">:: IDEA_1:19</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">i</font>, <font color="Olive" title="b2">n</font> being   <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a>  st <font color="Olive" title="b1">i</font> <a href="idea_1.html#R1" title="IDEA_1:pred.1">is_expressible_by</a> <font color="Olive" title="b2">n</font> holds <br/> <a href="idea_1.html#K8" title="IDEA_1:func.8">ChangeVal_2</a> (<font color="Olive" title="b1">i</font>,<font color="Olive" title="b2">n</font>) <a href="idea_1.html#R1" title="IDEA_1:pred.1">is_expressible_by</a> <font color="Olive" title="b2">n</font> <span class="kw">by</span> <span class="lab"><a class="ref" href="idea_1.html#D8" target="_self" onmouseover="rs('idea_1/D8')" onmouseout="rh()">Def8</a></span>;<br/></div></div>
