I'm updating to Maple 2025. Are there any feature differences between Linux and Windows versions?

Thanks.

"I" is reserved for square root of -1.  I don't use complex numbers and want to use "I" in my equations.  How do I go about doing this?  I tried to unprotect it with a number of variations of quoting "I".

I'm using document mode with Maple 13 on Apple.

Thanks for your help.

I'm getting started with this. I'm reading books about General Relativity. Their notation uses superscripts and subscripts in Greek, for examples. But in the lessons for DifferentialGeometry and in applications I find in the Maple website, I see coordinate systems of (x,y), for example. Indices, raising and lowering, and other operations involve "d" and "D_" notation. Examples use something like T12 to represent what I would want to see as "T" with two subscripts having values of 1 and 2. I apologize if I'm not explaining the background to my question well.

Sometimes I've seen manipulations like this:

dx/dt = dx/dy dy/dt

in which the symbols of the derivatives are multiplied and cancelled like terms in equations. I can't remember nor find the justification for doing this. What's the explanation?

I can't get Maple to do this for me. If I make x an expression of y and y an expression of t, then it substitutes the expressions into the arguments, and I get a nonsensical result:

> y := t^3;
3
t
> x := 'y^2';
2