Question: Telling Maple not to assume all given expressions commute

Concrete example: Suppose I have two (2 x 2) matrices that have entries as operators or other non-commutative object.

In the following example Maple treats the entries like numbers:





How can I ensure that these are not commuted like ordinary numbers?

The second part of the question, is how I can also prevent arbitrary application of associativity if I so choose.

For example, I would like to say that in some circumstance like above, to suspend some of the assumptions on the number field.


(submitted June 17, 2008 - date appears incorrect on submission form!)



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