 Willis of the University of Nebraska at Kearney (UNK), Robert Dodier,
and other intrepid folk of the Maxima mailing list.
</p>
<p>There are probably lots of bugs.  Let me know.  <code>float</code> and <code>numer</code>
don't do what is expected.
</p>
<p>TODO : dimension functionality, handling of temperature,
showabbr and friends.  Show examples with addition of quantities containing
units.
</p>
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