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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E22">lemonto</font></span>: <a NAME="T27"><span class="comment"><font color="firebrick">:: FIELD_5:27</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">X</font> being   non  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>   <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a> <br/>  for <font color="Olive" title="b2">Z</font> being    <a href="hidden.html#M2" title="HIDDEN:mode.2">set</a> <br/>  for <font color="Olive" title="b3">r</font> being    <a href="field_5.html#M1" title="FIELD_5:mode.1">Renaming</a> of <font color="Olive" title="b1">X</font>,<font color="Olive" title="b2">Z</font> holds  <font color="Olive" title="b3">r</font> <a href="field_5.html#K3" title="FIELD_5:func.3">"</a>  is  <a href="funct_2.html#V2" title="FUNCT_2:attr.2">onto</a> </div></div>
