@vv Actually the character is called "blackboard 1" The characters are being used in  geometrical algebra boook I am studying. I live in Europe too (UK).
At least now I know whet to look for.

@vv 
so when I try what you say this gives an empty square which is not 

"ퟙ"

Is the a way to add these special characters to maple? Or fine what fornt does contain the charcaters?

@awass You can manually download it. 

From the Tools menu in Maple 2026, select Check for Updates, and follow the instructions.

If that option is dimmed, then Check for Updates is not enabled. Instead, you can download the update by clicking on the link below.

Download Maple 2026.2 Update Installers - Maplesoft

Hello. I an interested in Projective Geometric Algebra. Would you be willing to share your package? Currently I am trying to follow a book called Projective Geometric Algebra Illuminated by Eric Lengeyl. I currently have installed the Clifford package by Rafal Ablamowicz, available here fractal97/CLIFFORD: A Maple Package for Clifford Algebras by R. Ablamowicz and B. Fauser

I am havig difficulty understanding it at present.

@Rouben Rostamian  @acer @C_R  Thank you. All very informative answers. 

@acer Why would one use them. How could you call the proc again? I know in overloaded procedures the various procs are called anonymous but the overall procedure has a name. 

@Rouben Rostamian  Possibly. But I had elliminated a first and then used isolve to get b and c. Then used those values to solve for a. I gusss that assumed there would be an integer solution for a.

@Kitonum Wow! That is a great solution.

I think that is the way it has always been. I ran into that around 2018.

@C_R I should have pinned Maple 2026 not Maple 2026 (Shared Server) to the task bar.

@C_R A self created problem. I had pinned Maple (Shared Server) to the task bar.

@nm I cannot get that setting to stick. "Create a new engine for each document". Everytime I restart Maple it has reverted to "Share one engine among alll documents".

I was trying that because if i open a tab in a window Maple is very prone to hanging.
I'm using Maple 2026.1 and windows 10.

@janhardo  Now I see what you mean. Yes that is where I hava put it now. Yesterday I  put it here "C:\Program_Files\Maple\Users\maple.ini". Both actually work.

@acer  Ah that link clarifies things. So I moved the file from Maple2026/Users to C:\Users\Ronan.  That way my older versions of Maple can access it too.

@acer @janhardo I set the lifbary to as suggested by acer. The nest step is the package "mapel.ini" file needs to be placed in "C:\Program Files\Maple 2026\Users". My install of Maple did not have the "Users" folder. Maybe because it is a home user license?