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<div><span class="kw">theorem </span><a NAME="T49"><span class="comment"><font color="firebrick">:: TREES_1:49</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">w</font>, <font color="Olive" title="b2">s</font>, <font color="Olive" title="b3">t</font> being   <a href="finseq_1.html#NM1" title="FINSEQ_1:NM.1">FinSequence</a>  st <font color="Olive" title="b1">w</font> <a href="finseq_1.html#K7" title="FINSEQ_1:func.7">^</a> <font color="Olive" title="b3">t</font> <a href="trees_1.html#NR3" title="TREES_1:NR.3">is_a_proper_prefix_of</a> <font color="Olive" title="b1">w</font> <a href="finseq_1.html#K7" title="FINSEQ_1:func.7">^</a> <font color="Olive" title="b2">s</font> holds <br/><font color="Olive" title="b3">t</font> <a href="trees_1.html#NR3" title="TREES_1:NR.3">is_a_proper_prefix_of</a> <font color="Olive" title="b2">s</font></div></div>
