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Question: Strange behavior for noncommutative (dot) multiplication

Question:Strange behavior for noncommutative (dot) multiplication

vv 13795 Maple
evaluation noncommutative-product
10 hours ago
1 
f(a).b;            #ok
                           (f(a)) . b

op(0, f(a).b);     #ok
                               .

lprint(f(a).b);    #ok
f(a) . b

f(7).b;            #???
                             f(7) b

op(0, f(7).b);     #???
                               *

lprint(f(7).b);    #???
f(7)*b

 
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