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Question: limit gives an error when using assumption with adding '' to direction

Question:limit gives an error when using assumption with adding '' to direction

nm 9668 Maple 2022
assuming limit
October 31 2022
3

Is this a bug?

I was cleaning my code using mint. It told me that

             These names were used as global names but were not declared:  right

which is the direction used in a limit. When this happens, I just replace the name with 'right' to make it happy. This works for everything so far. But now limit fails with

      Error, (in assuming) when calling 'limit'. Received: 'invalid directional argument'

the strange thing this happens only when adding assuming after the limit.

It seems to me to be some parsing issue?  Attached is worksheet showing the problem.

Maple 2022.2 on windows 10. So for now I will remove the '' and let mint just complain.

> 

interface(version)

`Standard Worksheet Interface, Maple 2022.2, Windows 10, October 23 2022 Build ID 1657361`

> 

c:=0:
m:=1:
n:=0:
f:=1/4*x^2:
limit(diff((x-c)^m*f,x$(m-n)),x = c,right)/(m-n)!;
limit(diff((x-c)^m*f,x$(m-n)),x = c,'right')/(m-n)!;

0

0

> 

limit(diff((x-c)^m*f,x$(m-n)),x = c,right)/(m-n)! assuming real;

0

> 

limit(diff((x-c)^m*f,x$(m-n)),x = c,'right')/(m-n)! assuming real;

Error, (in assuming) when calling 'limit'. Received: 'invalid directional argument'

> 

 

Download issue_with_limit_oct_31_2022.mw
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