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A A^-1=A^-1A is a condition for ________

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in Finite Element Method by (110k points)
A A^-1=A^-1A is a condition for ________

(a) Singular matrix

(b) Nonsingular matrix

(c) Matrix inversion

(d) Ad joint of matrix

I got this question in unit test.

The above asked question is from Matrix Algebra topic in chapter Matrix Algebra and Gaussian Elimination of Finite Element Method

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Best answer
The correct option is (c) Matrix inversion

Best explanation: If det A not equal to zero, then A has an inverse, denoted by A^-1. The inverse satisfies the relation

  A A^-1 =A^-1A= I

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