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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E42">Th51</font></span>: <a NAME="T51"><span class="comment"><font color="firebrick">:: ALGSPEC1:51</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">S</font>, <font color="Olive" title="b2">T</font> being   <a href="catalg_1.html#NM1" title="CATALG_1:NM.1">Signature</a>  st <font color="Olive" title="b1">S</font> is  <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a>  holds <br/><font color="Olive" title="b2">T</font> is    <a href="algspec1.html#M2" title="ALGSPEC1:mode.2">Extension</a> of <font color="Olive" title="b1">S</font></div></div>
