My main question is: How to change the font used in worksheet by Maple for 1D input from Courier to another font say times new roman? Is there a setting for this so it applies all the time?

ps. I found Can-I-Change-the-Default-Fonts-or-Style-for-Maple-Worksheets-and-Documents?language=en_US  (very hard to follow and confusing, but it seems that is only way to fix this problem now is to change the default font).

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I noticed strange font problem using Maple 2023 on windows 10. This problem does not show on Maple 2022.2 (at least I do not think I've seen it or noticed it before). 

Variables with _ between the names, will have the underscore not display sometimes as I move the cursor around (movie at end).

When scrolling back up, the underscores no longer become visible. 

But as I move the cursor over the variable name which containes the underscore, they will now show up.

I am sure this is a font issue. The zoom is set at 100%. I made no changes at all other than making the input 1D math as I normally do and set the default to worksheet. Some of my setting are below.

This could be a DPI issue settings of some sort. My monitor is standard monitor (not a 4K one) and again, I have not changed any settings on my PC after I installed Maple 2023 and did not change any hardware.

Here is some system information also

Here is the movie showing the problem

As I play more with it, I notice a common theme. This happens when I hit the UP ARROW to go to the line above. Then suddenly the underscroes no longer visible. Once I hit the LEFT arrow (now I am at the above line), they show up again.

Here is another movie which more clearly shows this.

This makes it very hard to work with the code in the worksheet. But I am sure this can be fixed as it looks like just a font configuration issue with Maple on windows. But I do not know what it is and how to fix it.

I found something new. When setting the ZOOM at 125% instead of 100% as above, I notice the underscores do not completely disappear but become THINNER but one can still see them. This affects only the underscores. When the ZOOM at 150%, they do not change at all.  Here is a movie. first part at 125%. Notice how they become little thinner when doing the same thing as above. But at 150% they remain visible because they do not change thinkness. When going back to 100% zoom, they  no longer show.

So the problem is that they are there all the time, but depending on the ZOOM level, they beome thinner and thinner until they become invisible to the eye.

I found some related issue on windows 10 with some application where this problem shows up.

some-characters-missing-or-cut-off-when-displayed-on-screen

 "When you view your document in Microsoft Word, some characters may be missing, or the top (or bottom) of some characters may be cut off.

This problem may affect the following types of characters:

Underscore"

The above is about WORD, but it could as well apply to Maple?

I also found  underscore not rendering with courier

"Underscore characters are not rendered in new Google Docs in the Courier
New 11pt or 12pt fonts."

My question is: How to change the font used in worksheet by Maple? Now it is using Courier. May be if I change the font, this problem will go away?

Update: Found a workaround!  It is the font used!  I changed from Courier to Times New Roman and now the underscore do not change thinkness!  I just need a way to make this permenant for all 1D Maple input.   Here is a new movie showing it is fixed. You can see the underscores remain visible, all at 100% ZOOM level. Once I change to Courier, the problem show up again. 

I am not sure if this is a Maple issue or windows.

I have noticed this before few times. I wonder if others have seen it.

When I have Maple open, (with may be few worksheets open) and not being used at all for anything and it is not running anything, after sometime (say 2-4 hrs or more), when I go back to using Maple, I find the GUI unresponsive. Nothing happens. Clicking on anything does nothing, It is frozen. Resizing the window, it become black and does not repaint.  

But If I wait about 5-10 minutes after doing this window resizing, it suddenly becomes responsive again and it become alive again.  This happened twice this week, where I was about to just kill Maple. Good thing I did not.

It feels like the Maple process/frontend went to sleep when not being used, and it takes few minutes to wake it up by shaking the window. I do not know what else could explain this.

This is windows 10. Latest updates and lots of RAM and nothing else is running on the PC at this time.

I go take a nap, come back and notice this. It does not happen all the time, but noticed it twice this week.

Any others seen this problem? Does Maple process go to sleep or hibernate when it detects it is not being used for sometime? Looking at task manager when this happens, I see no CPU activity at all and no memory changes at all in any of the servers.exe. So I think this might be a GUI issue, where Java go to sleep or something.   

Or it could be a windows 10 issue and not Maple. But I only noticed this with Maple where it seems to go to sleep when not used.

This is second order ode solved using series method. This problem from textbook. The solution given by Maple does not match the book. I also solved this by hand and my hand solution agrees with the text book. I also solved this using Mathematica and its solution agrees with the book. 

Maple solution does not agree with the book for y2.  i.e. the general solution for this problem has the form 

    y= c_1 * y1 + c_2* (  y1 * ln(x)  +  y2 )

This is a Frobenius series method, since regular singular point and it falls into the hard case, where roots of indicial equation has difference of integer and where the second solution y2 can't be obtained using same method as y1 due to being undefined if using same method. So it require adjustment to the Frobenius series method.

This is ode

restart;
Order:=10;
ode:=x*diff(y(x),x$2)-3*diff(y(x),x)+x*y(x)=0;
dsolve(ode,y(x),'series')

Maple says that

   y2 = -144 - 36*x^2 + 1/2*x^6 - 25/1024*x^8 + ...)

First, it is missing x^4. And not able to make other coefficients match book. Book says y2 should be

   y2 = 1 + x^2/4 + x^4/64 - (11 x^6)/2304 + ....

And that is what I get and also Mathematica:

I do not have screen shot now of the page from the book to show. It is from an old textbook. Will try to make screen shot if needed.  This is problem 5, page 212 from SCHAUM's "differential equations" by Frank Ayers. 1952 edition. There is free PDF files on the net. Here is screen shot

My question is, why is Maple's series soluiton for the second basis solution y2 different? Could someone verify this? It also failes to verify it

restart;
ode:=x*diff(y(x),x$2)-3*diff(y(x),x)+x*y(x)=0;
Order:=10;
sol:=dsolve(ode,y(x),'series');
odetest(sol,ode,'series','point'=0)

Update

I've testsed few more problems, solved by hand and verified using Mathematica. All these problems give wrong solution by Maple for y_2. At least the solutions do not match the book and do not match my hand solution and do not match Mathematica. In all cases Mathematica's solution and my hand solution match the book. 

All these problem fall into the same difficult case of Frobenius series, where roots of indicial equation differ by integer and where y_2 can not be obtained directly using similar method used to obtain y_1. Other cases of Frobenius roots, Maple give complete correct general solutions. It is only this case where there seems to be something wrong.

In all of these problems below, y_1 solution is correct. It is the last series in y_2 shown which does not agree with book and it is this part which require using modifed method to obtain as explained on the book where these problems are solved from the above links. All the books used can be found online.

Please see attached worksheet.
 

Download series_solutions_Frob_difference_integer.mw

From https://maplesoft.zoom.us/webinar/register/WN_qidPG4qHRWGiTyO65vnGpw?timezone_id=Europe%2FParis

Is the recording of  Sneak Peek at Maple 2023 made on march 1,  available anywhere to see on Maple website or somewhere else? 

Update

Recording is at https://www.maplesoft.com/webinars/recorded/featured.aspx?id=2100  but need to first register/login if you are memeber of maplesoft.com

"The recording will start immediately after filling out the form."

What is the reason Maple likes to do this

arccos(sin(x));

         Pi/2 - arcsin(sin(x))

Both are correct, but the first has leaf count of only 3 and the second expression has leaf count of 11.

Surely the first is simpler to look at and read so the second form is not simpler.

What is the logic behind this automatic transformation? And did Maple always do this?