The Default, Unprefixed Namespace

• Suppose you want some MathML like this:

<?xml version="1.0" encoding="UTF-8"?>
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mrow>
    <mi>f(1)</mi>
    <mo>=</mo>
    <mn>1</mn>
  </mrow>
  <mrow>
    <mi>f(2)</mi>
    <mo>=</mo>
    <mn>1</mn>
  </mrow>
  <mrow>
    <mi>f(3)</mi>
    <mo>=</mo>
    <mn>2</mn>
  </mrow>
</math>