t_expr : <span><span>Polka.strict Polka.t</span> <a href="index.html#module-A">A</a>.t</span> <span>&#45;&gt;</span> Apron.Linexpr1.t * Apron.Linexpr1.t</code></dt><dt class="spec value" id="val-is_abstraction"><a href="#val-is_abstraction" class="anchor"></a><code><span class="keyword">val</span> is_abstraction : <span><span>Polka.strict Polka.t</span> <a href="index.html#module-A">A</a>.t</span> <span>&#45;&gt;</span> <span>Mpqf.t <a href="../../../Libabsolute__Tools/VarMap/index.html#type-t">Libabsolute_