dialogue could have different entries for x1 and x2 but Elmi is just saying oh we have to gosh is 1 4 X 1 1 4 x2 they could have different variances that's it now if we're not on the coordinate line system shirt then it won't look like a diagonal but the intuition remains the same there exists a coordinate system where this would be diagonal and easy to think about I also remember back when we did lqr I told you any matrix can be any symmetric matrix in a quadratic form is fully general because we have a non symmetric