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diff --git a/library/math/constants.factor b/library/math/constants.factor
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+++ b/library/math/constants.factor
@@ -0,0 +1,37 @@
+! :folding=indent:collapseFolds=0:
+
+! $Id$
+!
+! Copyright (C) 2003, 2004 Slava Pestov.
+! 
+! Redistribution and use in source and binary forms, with or without
+! modification, are permitted provided that the following conditions are met:
+! 
+! 1. Redistributions of source code must retain the above copyright notice,
+!    this list of conditions and the following disclaimer.
+! 
+! 2. Redistributions in binary form must reproduce the above copyright notice,
+!    this list of conditions and the following disclaimer in the documentation
+!    and/or other materials provided with the distribution.
+! 
+! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+IN: math
+USE: kernel
+
+: i #{ 0 1 } ; inline
+: -i #{ 0 -1 } ; inline
+: inf 1.0 0.0 / ; inline
+: -inf -1.0 0.0 / ; inline
+: e 2.7182818284590452354 ; inline
+: pi 3.14159265358979323846 ; inline
+: pi/2 1.5707963267948966 ; inline