![]() ![]() ![]() This property (of leaving things unchanged by multiplication) is why IĪre each called the "multiplicative identity" (the first for matrix multiplication, the latter for numerical multiplication).īut while there is only one "multiplicative identity" for regular numbers (being the number 1), there are lots of different identity matrices. Matrix I (that's the capital letter "eye")ĭoesn't change anything, just like multiplying a number by 1ĭoesn't change anything. The "identity" matrix is a square matrix with 1's on the diagonal and zeroes everywhere else.
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