why mupad messes up my terms?

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timo
timo 2015-12-8
回答： Walter Roberson 2015-12-8
I have this code Why Mupad adds this annoying - in front? Is a bug?

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Walter Roberson
Walter Roberson 2015-12-8
It is not a bug. Notice that the order of the numerator has changed from V[B]-V[N] to V[N]-V[B] with a corresponding change of sign of the overall subexpression. V[B]-V[N] = -(V[N]-V[B])
Why? Because it felt like it. Symbolic expressions may be re-ordered whenever they are not held, and when you used the evalAt operator you unheld the expressions.

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