pe_3_with_strategy.html">envelope
          (with strategy)</a>, <a class="indexterm" href="reference/algorithms/envelope/envelope_2.html">envelope</a>
</dt>
<dt id="ientry-idm45606676266720">equals, <a class="indexterm" href="reference/algorithms/equals/equals_3_with_strategy.html">equals
          (with strategy)</a>, <a class="indexterm" href="reference/algorithms/equals/equals_2.html">equals</a>
</dt>
<dt id="ientry-idm45606654288032">equal_to, <a class="indexterm" href="reference/spatial_indexes/observ