How is the matrix of the affinity of base the plan of equation x+2*y-z=1, of direction u <1,0,-1>and of ratio 2 determined? Thank you.

How to know the internal procedures of Maple for instance : taylor or laurent ? Thank you.

I don't know how overcoming this error . Thank you. MyPackage := module() export f1, f2; local loc1; option package; f1 := proc() loc1 end proc; f2 := proc( v ) loc1 := v end proc; loc1 := 2; end module: savelib('MyPackage'); Error, cannot open archive, C:\Program Files\Maple 2018\lib, for writing. restart; with(MyPackage); Error, invalid input: with expects its 1st argument, pname, to be of type {`module`, package}, but received MyPackage

How to build a library (package) containing my own procedures ? Could you give me an example. Thank you.

A line is deternined on one side by 16*x-2*y-11*z=0, 14*x-y-10*z=3 and on the other by (x-2)/3=(y-5)/2=(z-2)/4. Are they equivalent  ?  Thank you.