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Question: Physics package bug in Maple2017

Question:Physics package bug in Maple2017

Mbert 50 Maple 2017
June 16 2018
3

Hello,

it seems that Maple2017 handles the noncommutative product wrongly (while it used to do it properly up to maple 17 afaik). 

 

CODE:

with(Physics);
Setup(noncommutativeprefix={P,Q});
Q^2*P*Q + Q*P*Q^2;
simplify(%);

 

gives a correct result: BUT 

Q(t)^2*P(t)*Q(t) + Q(t)*P(t)*Q(t)^2;
simplify(%)

 

gives the result:

2Q(t)^3*P(t)  (which is wrong).

It used to work fine in Maple 17. I need to differentiate noncommutative polynomials in P(t), Q(t), which was done without problem in Maple 17 but now seems to be broken. 

 

Any explanation/workaround/fix? Is it fixed in Maple 2018?
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