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<div><span class="kw">theorem </span><a NAME="T13"><span class="comment"><font color="firebrick">:: INT_1:13</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">i1</font>, <font color="Olive" title="b2">i2</font> being   <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a> holds  <font color="Olive" title="b1">i1</font>,<font color="Olive" title="b2">i2</font> <a href="int_1.html#R2" title="INT_1:pred.2">are_congruent_mod</a> 1</div></div>
