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Active-matrix organic light-emitting diode.
Active Matrix Organic Light emitting Diode
It is the matrix 1/3It is the matrix 1/3It is the matrix 1/3It is the matrix 1/3
To find the original matrix of an inverted matrix, simply invert it again. Consider
A^-1^-1 = A^1 = A
From Wolfram MathWorld:
The inverse of a square matrix A, sometimes called a reciprocal matrix, is a matrix A-1 such that
AA-1=I
where I is the identity matrix.