Hi,
We have currently
sage: x, y = var('x y')
sage: fyx = function('f')(y, x)
sage: fyx.arguments()
(x, y)
which is just the reverse of the expected output.
Similarly, we have
sage: atan2(y,x).arguments()
(x, y)
Taking a look at the code, one sees that fyx.arguments() calls
fyx.variables(), which returns a "sorted tuple of variables that occur in
this expression" (according to the documentation). The "sorted" action
explains the result. But the latter remains plain false.
Note that SymPy provides the correct result:
sage: fyx._sympy_().args
(y, x)
sage: atan2(y,x)._sympy_().args
(y, x)
Eric.
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