Subject: Re: Possible bug in inverse Trig funcs in ACL
From: Erik Naggum <>
Date: 1998/09/09
Newsgroups: comp.lang.lisp.franz,comp.lang.lisp
Message-ID: <>

* Matt Kressel <>
| Secondly, why should four or five implementations return the same number,
| precise to twelve or more places, and another differ on the 9th digit?

  one easy answer is that those four or five use the same implementation of
  `acos' and/or the floating-point parser, such as the system math library.
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