Jacal is a symbolic math package written in Scheme by Aubrey Jaffer. It is usually installed as an extra package in SLIB (see section Packages not shipped with Guile).
You can use Guile's interface to SLIB to invoke Jacal:
(use-modules (ice-9 slib)) (slib:load "math") (math)
For complete documentation on Jacal, please read the Jacal manual. If it has been installed on line, you can look at section `Jacal' in The SLIB Manual. Otherwise you can find it on the web at @url{http://www-swiss.ai.mit.edu/~jaffer/JACAL.html}
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