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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E35">Th77</font></span>: <a NAME="T30"><span class="comment"><font color="firebrick">:: GRZLOG_1:30</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">t</font>, <font color="Olive" title="b2">u</font>, <font color="Olive" title="b3">v</font>, <font color="Olive" title="b4">w</font> being   <a href="grzlog_1.html#NM2" title="GRZLOG_1:NM.2">GRZ-formula</a>  st <font color="Olive" title="b1">t</font> <a href="grzlog_1.html#R4" title="GRZLOG_1:pred.4">LD-=</a> <font color="Olive" title="b2">u</font> &amp; <font color="Olive" title="b3">v</font> <a href="grzlog_1.html#R4" title="GRZLOG_1:pred.4">LD-=</a> <font color="Olive" title="b4">w</font> holds <br/><font color="Olive" title="b1">t</font> <a href="grzlog_1.html#K16" title="GRZLOG_1:func.16">'&amp;'</a> <font color="Olive" title="b3">v</font> <a href="grzlog_1.html#R4" title="GRZLOG_1:pred.4">LD-=</a> <font color="Olive" title="b2">u</font> <a href="grzlog_1.html#K16" title="GRZLOG_1:func.16">'&amp;'</a> <font color="Olive" title="b4">w</font></div></div>
