Mathematical Variable: <var>

The <var> element defines a mathematical variable:

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<p>Einstein wrote:</p>

<p><var>E = m c <sup>2</sup></var></p>

<p><i>E = m c <sup>2</sup></i></p>

Einstein wrote:

E = m c 2

E = m c 2

I am not clear exactly when I would use this but apparently it's inappropriate for any usage other than mathematical equations.

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