l-additive_identity" class="anchor"></a><code><span class="keyword">val</span> additive_identity : <a href="../argument-1-S/index.html#type-t">S.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="../argument-1-S/index.html#type-t">S.t</a> <span>&#45;&gt;</span> <a href="../argument-1-S/index.html#type-t">S.t</a> <span>&#45;&gt;</span> bool</code></dt><dt cla