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Tuples reduce the operators <code>==, !=, &lt;, >, &lt;=</code> and <code>>=</code> to the corresponding elementary operators. 
This means, that if any of these operators is defined between all elements of two tuples, then the same operator is defined between the tuples as well.

The equality operators for two tuples <code>a</code> and <code>b</code> are defined as:
<ul>
<li><code>a == b</code> iff for each <code>i</code>: <code>a<sub>i</sub> == b<sub>i</sub></code></li>
<li><code>a != b</code> iff exists