http://lispnyc.org:80/blog/lisppets/the-inverse-of-a-famous-equation Happy New Year! Even if you have seen this before, Ihope you will admire the quality of a good numeric implementation: [1] (/ (log -1) (sqrt -1)) 3.1415927 [2] (typep * 'real) T en Vassil Nikolov Mon, 04 Jun 2012 06:59:19 GMT Pebble (http://pebble.sourceforge.net) http://backend.userland.com/rss