What does an identity matrix do?

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What does an identity matrix do?

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Answer 1 · 2015-05-23T16:46:19

In fact it does nothing.

The identity matrix is such a matrix #I#, for which #AA_A I*A=A*I=A#. This definition means, that the identity matrix is such a matrix, which doesn't change another matrix, when multiplied

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What does an identity matrix do?

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