On Mon, 2012-12-03 at 13:46 -0800, Richard Fateman wrote: . . . > and thus > (= 0.0 -0.0) could be true even though there are ways of distinguishing > them. And FWIW at least SBCL 1.0.18.debian says so: * (= 0.0 -0.0) T * The others (eq, eql, equal) all returned NIL. -- Bill Wood