how to pull real numbers out of a linear funktion ?
I want to define a function f[x_] with the property, that
f[c_ x_] := c f[x] whenever c is a real number
f[c_ x_] := -c f[x] whenever c is a komplex number.
It semms to me, that mathematica can not give a variable the attribute
"real number" or "complex number".
But it should be easy ... somehow ;-)
Roland Bollmann (student of physics)
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