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Inverting a non-square matrix


Hi all,

I learnt a bit of Mathematica when I was student and I need a formal
calculation of the inverse of a non square matrix. But we do not have
the software in my department.
Can anyone say me if it is possible, and what are the formulas?
My matrix is:
A =
[a b c d]
[e f g h]
[i j k l]
and all the parameters are variable.

Thank you by advance!



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