@Thomas Richard Thanks, I was aware of odetest. But there is a simplicity and obviousness to plugging a solution back into the original that appeals to me.

@Alejandro Jakubi No, I haven't seen any adequate documentation of the stop button. However, I've noticed three things that make it inadequate (I am nearly sure about these, but I haven't seen any documentation).

1. The button will only stop a process during a garbage collection. Ordinarily there is a garbage collection every second or two, so this isn't ordinarily a problem. But if code is very memory efficient, it can be several minutes before there is one.

2. The button will only stop the kernel, not the GUI. This is very frustrating when you've accidentally entered a quick command that produces thousands of lines of output.

3. The button's effect is unpredictable and usually undesirable when applied to multithreaded code.

@nm It is a problem. It is often complained about.

I indeed did retype the OP's expression, although I wish that I didn't need to.

Your question from yesterday specified that A and B were integer. The formula, with A=151 and B=47, is a famous formula for Pi that you can look up on Google. It's called the Bailey, Borwein, and Plouffe formula.

@Alejandro Jakubi But also note that `evalf/int` is largely not built-in. I think that anything that can be stopped with the stop button can be stopped with timelimit.

@xx50xx Kitonum is setting z=0 to produce the ellipse in the xy-plane which when rotated about the y-axis will generate the ellipsoid. That way he can use the formula for the area of a surface of revolution.

@nm The Crout factorization is a lower triangular L and unit upper triangular U.

@Carl Love Is anyone working on these problems? I am especially interested in the problem of uploading worksheets for display. I am tired of cut-and-pasting entire worksheets with every input group and every output group requiring a separate cut.

@Thomas Richard Thanks! Plain one-argument simplify didn't do much.

@nm The OP means Pi = sum(..., n= 0..infinity).

@Kitonum You could also replace `` with ` ` and thus maintain the intended blank-line appearence.

This must be considered a bug as `` is common in Maple code, especially as a function.

With that combination of keystrokes, nothing special happens for me. I'm on Windows 8, Maple 17.02/64, Standard GUI.

@J4James You can also use dsolve option method= classical[rk4].

@emmantop Okay, we need a specific numeric value for parameter k_1.

Your code has a variable with no specified value: zeros. Is this something that you assigned earlier? Could you show the plot command that you used?