As another example, here is something I found in Mathematica:
In: Sum[f[i], {i, 1, 5, 2}]
Out: f[1] + f[3] + f[5]
In this case, I believe it is treating f as a function, which is fine as I
will eventually be writing y as a function. I just didn't know how I should
define y in Sage so that it would let me do this type of thing.
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