Let's see, in sage then you have the following syntax.
(x,y) means a list
f(x,y) means a function application
(x+y) means grouping for arithmetic.
RationalField(x) means, uh, sortof "in indeterminate..."
Integer(4) means, uh, set the type? force a coercion?
Are there any other distinct uses of ()?
Mathematica uses
{} for lists
[] for function arguments (in SMP these were called projections)
() for grouping
Maxima uses
(a,b,c) as meaning something like begin a; b; c end
[] for lists and array subscripting
() for grouping and function calls.
So it seems that you have a choice.
However, the Sage choice is kind of confusing.
x //a variable
(x ) // a list of one item or a group consisting of x alone, hence x.
((x)) // a list of one item, grouped alone. Or a list of a list of
one item. Or just x.
That is, if (a+1,a+2) is a list of 2 items, is (a+1) not a list of
one item?
I'm sure there is a simple explanation.
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