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From: Richard Shann <richard@rshann.plus.com>
Newsgroups: gmane.lisp.guile.user
Subject: negating a number
Date: Wed, 15 Jan 2014 18:24:49 +0000
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Is there something neater than

(- 0 amount)

to negate a number? Can't spot anything in the manual ...

Richard Shann