lattice.t</a> <span>&#45;&gt;</span> <a href="../../../../Bastet/Bool/Join_Semilattice/index.html#type-t">Bastet.Bool.Join_Semilattice.t</a> <span>&#45;&gt;</span> <a href="../../../../Bastet/Bool/Join_Semilattice/index.html#type-t">Bastet.Bool.Join_Semilattice.t</a> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-commutativity"><a href="#val-commutativity" class="anchor"></a><code><span class="keyword">val</span> commutativity : <a href="../../../../Bastet/Bool/Join_Semilattice/index.