@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.

You simply need to learn how to do better searches with Google (or other search engine). The following searches using Google in Google Chrome returned exactly the info that you wanted as the the top hits. These were my 1st attempts: no guessing, no refining.

largest maplesoft product

earliest maple math software release

Changing the name won't help, because all the old web pages will still contain "Maple", which'll thus be the word indexed by Google.

@sursumCorda Your map2(`?()`, [f], L) is a great idea. It can be further shortened to

[`?()`]~(f, L)

In addition to @mmcdara 's fine Answer, I want to caution you to be careful not to confuse these two error messages:

1. initial Newton iteration is not converging
2. Newton iteration is not converging

The 2nd is much more difficult to fix than the 1st. Fixing the 1st often leads to the 2nd; nonetheless, you should still fix the 1st before attempting to fix the 2nd. 

@aroche I believe that the following much simpler is evaluation shows a more-proximal cause of the disappointing FAIL that you obtained for the cos/sin problem:

is(Or((x,-x)=~ abs(x))) assuming x::real;  #1
                              FAIL

Compare with this correct evaluation:

is(signum(x) in {-1,0,1}) assuming x::real;   #2
                              true

It should be easy to convert problem #1 to problem #2, and I think that this alone may be enough to solve the cos/sin problem and numerous others involving a disjunction of the branches of sqrt under a real assumption.

The above Answer was written before I saw that simulated rolls of a standard 6-sided die were a requirement for you. The above code can be easily modified to accomodate that. A roll d in 1..6 can be converted to your {-1, 1} by the simple function sign(d-4), so the subs is still not needed. (See help page ?sign, and note that sign(0)=1, and don't confuse sign with signum.)

N:= 1000:
randomize(); #optional 
D6:= rand(1..6): #6-sided die simulator
Y:= [seq['scan'= `+`]](sign~([seq['scan'= D6]](1..N) -~ 4)):
plots:-listplot(Y, size= 200*[4,1], thickness= 0.7, color= red);

Note the distinction between type(R, some_type) and hastype(R, some_type). The hastype checks R and all of its substructures. I think that what you want is simply type(...).

The ​​​with command has global side effects, and it shouldn't be used in procedures (or, at the very least, it shouldn't be used in the way that you've used it). The fact that it may sometimes seem to work is irrelevant. You can replace the three with commands with 

uses plots, DEtools, PDEtools;

This is an outstanding explanation. You should formally publish it for a wider audience than the Maple community. 

So, is each pair of teams supposed to play exactly one match? For 8 teams, there are 28 pairs, so 2 matches per week covers 14 weeks. On such a schedule, 4 teams wouldn't play on any given week. For 10 teams, there are 45 pairs, so 3 matches per week covers 15 weeks. This schedule would also have 4 teams not playing on any given week.

@salim-barzani When someone on MaplePrimes says "1D input", this "Maple Input" that you see on the menu within Maple itself is exactly what they mean. I don't think that the term "1D input" is officially used by Maplesoft. Thiat's a bit strange because "1D input" is the most natural term for the mode that is the alternative to 2D Input, any either mode is a method of giving input to Maple, so a naive user wouldn't guess that "Maple Input" refers strictly to the non-2D mode.