MathGroup Archive 2005

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Why does Inverse[M] hesitate?


I'm puzzled by the following in Mathematica 5.0 and 5.1:
If I define a symbolic matrix A and a symbolic matrix B and ask to
calculate Inverse[A].B, the output is the same input operation with
the A and B expanded. I have re-input this output, I finally get the
result.


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