Axiom 15.3.2 (Peano). Optional.
Here’s the statement of the axiom.
<assumption>, <axiom>, <conjecture>, <heuristic>, <hypothesis>, and <principle>. The content of these tags is very simple. They allow an optional <title>, an optional <creator>, optional <idx> tags, and then a <statement> much like a <theorem> does.
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<axiom>
<title>Optional</title>
<creator>Peano</creator>
<statement>
<p>
Here's the statement of the axiom.
</p>
</statement>
</axiom>