@waseem I'd be curious to see that (except for u(x)=exp(x), I mean). Perhaps dsolve can be improved to cover this DE - just a guess. Thanks!

@reid The error message suggests that your installer might be corrupt. For a start, its correct size is 1494398252 bytes. If yours differs, try downloading it again.

Apart from that, I would not rely on such a platform. We do support Ubuntu, of course, but have never tested in WSL, as far as I know.

Which Ubuntu version are you running, by the way?

@Preben Alsholm Same in Maple 2018.1, but with much lower memory requirements (several gigabytes). Haven't measured timing, though.

BTW, this helps a lot afterwards:

ssol2:=simplify(sol[2],'size'): length(ssol2);

Technically, it is possible to display ssol2 without changing elision thresholds.

@vv The new encryption option is not intended for obfuscating any existing library code, but for user procedures. Think of commercial customers who need to protect their IP when delivering Maple-based applications to clients or cooperation partners.

You can always send bug reports (and feature suggestions etc.) via MaplePrimes menu item "More > Submit Software Change Request". Alternatively, send an e-mail to support@maplesoft.com. Make sure to include product name, version number, a clear description, a reproducible example. Ideally, attach a complete worksheet that exhibits the problem.

@sand15 About the missing factors: I'm not a statistician, but I think your interpretation is correct. You might have noticed that the "good" and the "wrong" answer differ by a factor of 32*Pi^5 = sqrt(2*Pi)^10 (where 10 is the sample size).

[Increase Digits e.g. to 14 and rerun the calculations, then identify(good/wrong) to check.]

@Adam Ledger A common recommendation is to insert

currentdir(cat(kernelopts(homedir),"/Documents")):

(or any writable directory of your choice) between restart and file operations. If you like that setting, place it in your initialization file, which doesn't exist by factory default. So create it using any text editor. Under Windows, it's maple.ini in your home directory (apparently "C:\Users\the_r" in your case). On Linux and Mac OS, it's ~/.mapleinit (i.e. a hidden file in your home directory).

Why you are getting permission errors is another issue, probably independent of Maple. Anything reconfigured incorrectly on your filesystem?

@bobtomeston123 Well, simply follow the description and run the examples step by step (open the help page as a worksheet for that purpose). Calculate the three vectors as hinted by Kitonum, and feed them into the command.

TripleScalarProduct(V1,V2,V3);

I find it easier than the direct LA approach, but that's a matter of preferences.

I'm unsure about your claim "answer should be 4 cubic units", though...

@weidade37211 Sorry, I thought you meant mathematical symbols such as Beta which can be rendered as the Greek letter.

About graphical symbols, I agree with vv. I don't see any bug here. If you wish to see the legend option changed, feel free to submit an SCR (which is also for feature requests, not only bug reports). See the "More" menu at the top right of MaplePrimes menu bar.

@vv Just a side note (for the thread opener) that this general form can be obtained by

sol:=pdsolve(pde,u(x,t),HINT='strip');

... if you really want the computer to help you find this obvious solution. :-)

@digerdiga Our e-books should be available in the April/May timeframe. About your 2nd question, the product description in our webstore is pretty clear: "This is the Maple 2017 version. When the 2018 version has been released, it will be made available to you."

@digerdiga That's because the Study Guides (Calculus and Precalculus) still need to be updated, just like all other e-books and toolboxes. Once that is done, the bundle will contain Maple 2018, of course.

You have 5 equations, but 21 unknowns in them. Which variables do you want to solve for? That is not clear (to me at least). What is the "basic reproduction number"?

Besides the characteristic strip method, there are various other hints that you can give pdsolve, e.g. multivariate separations like these:

pdsolve(pde,HINT=g(x,y)+h(z,w));
pdsolve(pde,HINT=g(x,z)+h(y,w));
pdsolve(pde,HINT=g(x)+h(y,z,w));
pdsolve(pde,HINT=g(x,y,z)+h(w));

etc., and these are just for the additive separation ansatz. I haven't investigated any further, though.

Sorry, I haven't used Classic for many years - I'm using pure 64-bit software whenever possible. You may contact our support team; please provide as many details on hardware/software configuration as possible. However, I doubt that we can do much for Classic specific problems.