@nm I think that you're losing the 2nd solution by using remove_RootOf. Use allvalues instead.

I'm on my phone at the moment, so I can't check this in Maple.

The last two commands used in your attached worksheet are eval and limit. The eval is "applying a substitution" and the limit is "applying the limit to get the exact answer" (the two things you asked for in your title). Both commands were successful; so I don't know what you're asking about.

If I've misinterpreted something, please post a worksheet where the final result is incomplete or incorrect. And please make it so that I don't have to enter formulas from the paper.

When asking a Question here, it's always best to post a worksheet whose final result is incorrect, incomplete, or gives an unexpected error message.

@C_R You wrote:

• I had 3+ Maple seesions runing when I observed this and only one was affected.

You say that only one "session" was affected. But are all worksheet tabs open within that one session also affected? If you are seeing the problem, please check by opening a new or existing worksheet in the same session, to see if it inherits the problem.

@nm I use strictly worksheet mode and 1D Maple Input, so 2D Input or document mode is not the cause of the problem. I suspect that Windows has something to do with it. As stated, it only happens to sessions that have been open for a long time. Personally, I never shut down my computer or Maple unless some crash or mandatory system reboot forces me to: so I don't shut it down for loss-of-kernel crashes.

Yes, I have that problem exactly as you describe, and I've had it for years. It seems to happen much less with Windows 11, but it's not completely gone. As you said, it only happens when Maple has been open for some time (I'd guess 3 or more days). It's something that affects the GUI display only: the kernel does not "see" any of the altered characters, and the display of all open worksheets is affected. The errors are not saved in the worksheets.

There are several other characters affected this way, such as + (plus) and - (minus). Notice the + replaced by C on the 2nd line of your output. The minus sign gets replaced by K. I think that all the new characters come from an upright sans-serif font.

For Maple 2025, in its new GUI, I've only noticed this bug when using zoom-factor 150% (Ctrl-4). Do you notice it at other zoom factors?

Since it's a nuisance for me to shut down my whole Maple session, I've learned to read the altered characters as they are. There's a one-to-one correspondence between the new characters and the ones they've replaced, and the alterations are always the same.

I haven't reported this bug because I don't know how to reproduce it, and I fear that my report would thus be essentially ignored.

@nm I mentioned multiple times that I didn't claim that there would be any benefit to doing this, and that I only wrote the code so that you could safely explore what would happen if you stopped using remember tables. The removal of options remember or cache from approximately 1000 Library procedures is the only thing that my code does.

@vv From an asymptotic expansion with leading term sqrt(3/n), how do you get a limit of 1 instead of 0? Indeed, direct numeric computation of (sin@@n)(1.) for large n suggests very slow convergence to 0. Also, sin(x) < x for any x > 0.

@acer Thanks. It seems that your experience of it is quite similiar to mine. A little testing in Maple 2025 shows that evalf undertands it, but allvalues does not. 

I think that any usage of it by commands that generate RootOfs should be reported.

I assume that some other command returned to you that RootOf expression. What command was that? The indexing with repect to real roots is I believe very little known, and I don't think that other commands understand it when that RootOf is passed on to them.

If y is a nonnegative real, then RootOf(_Z^2 - y, index= 1) denotes the positive square root of y and index= 2 denotes its negative (positives come before negatives in the index order).

@acer The set Sol contains those inequalities, and the solve call is 

solve(Sol union area)

By the way, can you find any documentation on the real argument to RootOf? I saw some many years ago. It was quite sketchy, and now I can't find it at all.

@Scot Gould What makes you think "The folks of Maplesoft look at questions in MaplePrimes when making changes"? This Question about a dark theme has been asked at least twice in the past few years. 

As my vision is declining with age, I desperately need a dark background. It should be common sense that light letters on a dark background are far easier to read than dark letters on a light background because in the latter case the vast majority of the light hitting your retinae is superfluous information.

@Scot Gould @dharr @nm  Windows 11 has quick snaps to any corner-quarter screen also. 

I confirm that this is true in Maple 2025 Windows 11 also. No problem with older Maple.

Please upload the worksheet that has this problem using the green uparrow on the editor's toolbar. 

@janhardo I don't see any connection between your Reply and the OP's Question or its attached worksheet. Perhaps you were intending to answer some other Question on this forum.