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Allowed mathematical operators

The following Maple mathematical operators are recognized in an expression:

Note that the value of signum(x)=|x|/x where x is an interval whose absolute value is lower than
`ALIAS/value_sign_signum` is set to the Maple variable _Envsignum0. This allows one to specify the value of signum(0).

Jean-Pierre Merlet 2012-12-20