Issue 1139: Description and Differentiation of vector, tensor, and
multivector fields.
http://code.google.com/p/sympy/issues/detail?id=1139
Comment #29 by [EMAIL PROTECTED]:
More tests:
from sympy import *
class IF(Function):
def __new__(cls,Fstr,vars):
obj = Function.__new__(cls,Fstr,*tuple(vars))
return obj
x = sympy.symbols('x1','x2')
x1 = x[0]
x2 = x[1]
f = IF('f',x)
g = IF('g',x)
print 'f =',f
print 'g =',g
h = x1*g
print 'x1*g=', h
h = f*g
print 'f*g =',h
h = f+g
print 'f+g =',h
All work but f+g!
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