## delay in typing...

Anyone experience a delay in typing as the screen fills with text/math etc.?

I'm using Maple 2021 and as the space is filled typing slows. I can finish typing and watch the last 4 keys enter on the screen.

## Problem running xmaple 2020.2 in Ubuntu 20.04...

Since approximately a week ago, probably after some Ubuntu update, the xmaple 2021.2 interface started to crash after some simple commands, without any error message or log. I tried to run with java (open-jdk) 11 and 8, and I had the same problem. I still have an old 2017.3 version, and it works perfectly. The problem only affects the new Maple release.

Is there some bug report? What can I do?

## I have a problem with the "Diff" command....

Hi !

Looks like there is a bug in the inert "Diff" command.

I have Maple 2018 on Windows 10 ,64 bits.

Does Maple consider Diff(f(x),x) to be equal to Diff(f(x),[x]) ?

It should be the same.

Maple displays  that it is equal but keeps in memory something else.

In the attached file, I give a very simple example.

I don't like to say this but my old version of Maple V Release V (1997) is more consistent i.e.

this version shows it's different and  keeps in memory that difference.

diff-problem.mw

I wonder if newer versions have this problem ?

Best regards !

## How does fsolve work?...

When using the built-in fsolve function to find the roots of a polynomial, how does exponentiation occur? For example, x3 is found​​​​​​first, and then to find x4, will he start again from the beginning, that is, x*x*x*x, or will he take the value of x3​​​​​​ and multiply by x? The teacher is interested in finding out this, but I don't know how to find out myself.

## Why Maple can't put correct differentiate? Or did ...

Hello guys,

I try at the moment to solve this terms:

The function is: f(x,y)=2x2-3xy-(y+2)3+5

1. diff(2*x^2 - 3*xy - (y + 2)^3 + 5, x) = 4x output but this is wrong. The correct output is 4x -3y

2.diff(2*x^2 - 3*xy - (y + 2)^3 + 5, y) = -3*(y + 2)^2 that also wrong. The correct output is -3(x+(y+2)2 )

THX a lot

## Is there a way to convert symbolic values to nume...

I have been performing symbolic solutions on netlists using Syrup, and then performing worst-case analysis on the result using the ranges of all the variables.

I would like to add ifelse and/or piecewise linear expressions to my Syrup models. Using symbolic analysis, I can get multiple sets of results from Syrup based on the conditional statements. I'm thinking that if I could put Syrup solve inside my worst case analysis procedure and submit numeric values to Syrup, that the conditional expressions could be solved for.

I think there is something similar that can be done with Dynamic Systems.

Does this request make sense? Is it possible?

## Why is simplify ineffective with these combined as...

The expression

 (1)

simplifies to zero in the real range if y=0 is excluded.

 (2)

 (3)

Combining the above assumptions as attempted bellow does not simplify to zero

 (4)

 (5)

 (6)

 (7)

 (8)

## How to get a group that meeting the criteria?...

I'm a newbie to maple, I want to get a group that meeting the criteria with this code:

```with(GroupTheory);
G := SymmetricGroup(6);

do

H := Subgroup({RandomElement(G),RandomElement(G)}, G);

C := Core(H, G);

until is(GroupOrder(C) <> 1) and is(GroupOrder(C) <> GroupOrder(H));
H;
C;```

But it's seem I cannot construct subgroup. so I adjust it into:

```with(GroupTheory);
G := SymmetricGroup(6);

do

H := Subgroup({[[rand(1 .. 6)]], [[rand(1 .. 6), rand(1 .. 6)], [rand(1 .. 6), rand(1 .. 6)]]}, G);

C := Core(H, G);

until is(GroupOrder(C) <> 1) and is(GroupOrder(C) <> GroupOrder(H));
H;
C;```

However, it is clear that random numbers do not always satisfy the rules of permutation. So how can I use the loop to generate a random subgroup that satisfies the condition?

## How to ask maple to show its work in a complex int...

Hi!

I am wondering how maple did this calculation:

Show_Solution_Complex_Numbers.mw

How can I ask maple to show its work in this calculation?

## Solve an Integral...

how we can solve it

## Count Fridays 13 of a year...

How to adapt this program C to Maple ? Thank you.

Sub Les_Vendredi_13()
Dim Annee As Integer
Dim Mois As Byte
Dim Cellule As String
Dim Compteur As Byte
Cellule = "B2"
Compteur = 1
Columns("B:B")
.ClearContents For Annee = 1949 To 2009
For Mois = 1 To 12 If Weekday(Mois & "/13/" & Annee) = 6
Then Range(Cellule).Offset(Compteur, 0) = "13-" & Format(Mois, "00") & "-" & Annee Compteur = Compteur + 1 End
If Next Mois Next Annee Range(Cellule).Offset(Compteur, 0) = "Nbre = " & Compteur - 1
End Sub

## "fsolve"-ing an expression containing a cosh-funct...

Can anyone tell me what this means? (workfile maple.file.mw)

## Converting Degrees to Radians with assigned Units ...

I expected Maple Flow 2022 to return return 2 pi Radians as the answer to the below ... but instead it returned 360 arcdeg.

360 arcdeg * (pi rad/180 arcdeg) =

Question: Why don't the "arcdeg" units cancel out and Maple Flow 2022 return the answer 2 pi rad ?
I expected Maple Flow to handle the units by cancelling out the "arcdeg" units and return 2 pi rad as the answer.

(Note: in this post I placed a space between the numbers and the units for clarity ...
understanding that in Flow you actually enter the number, then press Ctl+Space+U then enter the unit.)

Thanks for any help.

## How do i solve for 18 variables with 18 equations?...

Hello,

maybe some of you can help me with this.

In the equations are variables F_[i][j] and GG_[i][j] (for i=1,2,3 and j=1,2,3). There are 5 Equations that equal 0 and 1 Equation that equals Q(given).
Is there a better way to try and solve this equations?

Thank you