/usr/share/axiom-20170501/src/algebra/ESTOOLS1.spad is in axiom-source 20170501-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | )abbrev package ESTOOLS1 ExpertSystemToolsPackage1
++ Author: Brian Dupee
++ Date Created: February 1995
++ Date Last Updated: February 1995
++ Description:
++ \axiom{ExpertSystemToolsPackage1} contains some useful functions for use
++ by the computational agents of Ordinary Differential Equation solvers.
ExpertSystemToolsPackage1(R1) : SIG == CODE where
R1 : OrderedRing
SIG ==> with
neglist : List R1 -> List R1
++ neglist(l) returns only the negative elements of the list \spad{l}
CODE ==> add
neglist(l:List R1):List R1 == [u for u in l | negative?(u)$R1]
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