I think you missed * between D[4](a) and the following parethenses (.......)

Maple understand D[4](a) as a function and (x, y, t, u(x, y, t), diff(u(x, y, t), x), diff(u(x, ............) as arguments list.

@Daniel Skoog 

I'm aware of using maplemint through code invoking. But, as you understand, it is natural to have uniform behaviour of Startup Code Editor and Code Edit Region. I hope, embeding maplemint into Code Edit Region is a matter of the near future.

Regarding zoom, Zoom-In/Zoom-Out buttons switch zoom between predifined levels (75-100-125 ...), but Ctrl+wheel, indeed, produces  more uniform stepping.

Regards

Thank you, Daniel, for detailed description of new features.

In order to tell something definitively, it is necessary to work with new release a while.

I can share only first impressions upon it.

1. I'm indeed excited about possibilities of Context Panel. Due to it, some actions can be performed many times faster.
2. Unfortunately, as I understand, the maplemint feature is embedded only into Startup Code Editor. I suppose, it makes sense to embed it in Code Edit Region.
3. Regarding interface changes, it is pity to remark that zoom factor remains the same -- separate 75%, 100%, 125% ... values. These values originated back in 1990s when graph possibilities of software were very poor. For example, old versions of PageMaker had also discrete zoom factors. Today, there are no software or hardware related obstacles to make zoom factor continuous, as in main part of modern packages.

Thanks, your explanation is completely clear.

What does the expression "a(x),b(x)" mean?

@Markiyan Hirnyk 

Thanks, this works....

@tomleslie 

Thanks, it works. 

@Kitonum 

Indeed, it is shorter, but I need subs, because other substitutions, except functions, are used in expressions.

@vv 

Thanks, it works!

Please, consider FromMatlab operator enabling to convert some Matlab statements into Maple ones.

@Markiyan Hirnyk 

Please, take into account, that the functions U1(x), U(x) are continuous, and f(x) is integrable. So, the function under integral is integrable, and integral converges.

Thanks, Bulat.

At last, I've understood your.

Булат, поясни твой вопрос. Каждая Problem начинается с раздела Solution, т.е. задача уже решена! Тебе нужно проверить это решение или что-то еще? Я не знаю квантовой механики и, возможно, не улавливаю какой-то смысл.

I've downloaded the book and written the Problem 45. 

To be honest, I am far from Quantum mechanics, but can try to undestand the problem as a mathematical task. As I understood, Problem 45 is not a problem requred to be solved. Description of the problem has no unsolved questions. Maybe, you intend to verify implications entering in the description of the problem. Please, clarify your question.

@Preben Alsholm 

Thank you, but for some reasons it is essential to use output = Array option. 

Thank you for exlanation, I realized, that equation has no enough smoothness.