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Hello.
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So here we let d be equal to the matrix, where we have our first row is a -0 -0 -0 -0, and then 0 -b -z -0, and then 0 -0 -0 -0, and then 0 -0 -0, where each of a, b, c, and d is either 1 or negative 1 or negative 1.
00:16
So then we get the matrix here to negative 1 -0 -0 -2 -1 -0 -0 -0 -2 -0 -0 -0 -0 -0 -0 -2 -0 -0 -0 -2 -0 -0 -2 -12.
00:35
And then times d is going to be equal to this matrix here, 2a squared, ab -0 -b -2 -b -2 -b -c -2 -c -2 -cquared, b -cccc2 -c2 -cquared, cd, d, 0 -0 -0 -0 -0 -c2 -c squared, cd, d, 0 -0 -0 -0 -0 -cd ,0 -0 -cd, 2d squared.
00:48
And we get the following equations then.
00:50
We get that ab is equal to negative 1.
00:54
We get that b, c is equal to negative 1.
00:56
And we get that c, d is negative 1...