what is invertiable matrix?

Hi,

If a square matrix A has an inverse A^-1, it is said to be invertible.  

In  mathematics and especially linear algebra, an n-by-n (square) matrix A is called invertible, non-singular, or regular if there exists another n-by-n matrix B such that

   AB = BA = I_n

where I_n denotes the n-by-n identity matrix and the multiplication used is ordinary matrix multiplication.

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