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<div><span class="kw">theorem </span><a NAME="T16"><span class="comment"><font color="firebrick">:: PROOFS_1:16</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">B</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a> <br/>  for <font color="Olive" title="b2">R</font>, <font color="Olive" title="b3">R1</font>, <font color="Olive" title="b4">R2</font> being   <a href="proofs_1.html#NM2" title="PROOFS_1:NM.2">Rule</a> holds <br/> ( <font color="Olive" title="b3">R1</font> <a href="proofs_1.html#K5" title="PROOFS_1:func.5">\/</a> <font color="Olive" title="b4">R2</font> is <font color="Olive" title="b1">B</font>,<font color="Olive" title="b2">R</font> <a href="proofs_1.html#V8" title="PROOFS_1:attr.8">-derivable</a>  iff ( <font color="Olive" title="b3">R1</font> is <font color="Olive" title="b1">B</font>,<font color="Olive" title="b2">R</font> <a href="proofs_1.html#V8" title="PROOFS_1:attr.8">-derivable</a>  &amp; <font color="Olive" title="b4">R2</font> is <font color="Olive" title="b1">B</font>,<font color="Olive" title="b2">R</font> <a href="proofs_1.html#V8" title="PROOFS_1:attr.8">-derivable</a>  ) )</div></div>
