# Quick Matrix Question

by GuitaristOfRa
Tags: matrix
 P: 3 Looking over a proof of something, I was confused at this step: We end up with: R$$^{T}$$ R = I (the identity matrix) This must mean that R$$^{-1}$$ = R$$^{T}$$ This is confusing me because I know that A A$$^{-1}$$ = I , but in the R case the transpose is on the left side instead of the right, and it seems to me that it matters what order the matrices are multiplied.
 P: 307 Okay, start with $$AA^{-1}=I$$. Can you turn this into $$A^{-1}A=I$$?

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