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In mathematics the '''identity matrix''' is the which does not change the size or values of a matrix under the operation of multiplication. The usually identity matrix is denoted <math>I</math> or <math>I_n</math>, and the operation of multiplication is discribed as,
In mathematics the '''identity matrix''' is the which does not change the size or values of a [[matrix]] under the operation of multiplication. The usually identity matrix is denoted <math>I</math> or <math>I_n</math>, and the operation of multiplication is discribed as,
:<math>AI=A</math> or <math>IA=A</math>
:<math>AI=A</math> or <math>IA=A</math>