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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E17">Th19</font></span>: <a NAME="T19"><span class="comment"><font color="firebrick">:: TOPS_5:19</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">f</font> being   <a href="zfmisc_1.html#V1" title="ZFMISC_1:attr.1">trivial</a>  <a href="funct_1.html#NM1" title="FUNCT_1:NM.1">Function</a><br/>  for <font color="Olive" title="b2">x</font> being    <a href="hidden.html#M1" title="HIDDEN:mode.1">object</a>   st <font color="Olive" title="b2">x</font> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a>  <a href="relat_1.html#NK1" title="RELAT_1:NK.1">dom</a> <font color="Olive" title="b1">f</font> holds <br/> <a href="card_3.html#K12" title="CARD_3:func.12">proj</a> (<font color="Olive" title="b1">f</font>,<font color="Olive" title="b2">x</font>) is  <a href="funct_1.html#V2" title="FUNCT_1:attr.2">one-to-one</a> </div></div>
