RE: mostly mactex

• Subject: RE: mostly mactex
• From: willisb at unk
• Date: Mon, 19 Aug 2002 12:35:47 -0500

Thanks to Stavros Macrakis for catching my mistake; let me try again

(defprop %signum ((x) ((mtimes) 2 (($dirac_delta) x))) grad)

Some say (for example B. Roos "Analytic Functions and Distributions in
Physics and Engineering," page 308) that diff(abs(x),x) = signum(x).
Others may disagree.

Barton

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