Posted by Alice on Tuesday, February 24, 2009 at 6:12am.
Which 3 x 3 matrix represents a reflection in the yz plane followed by inversion through the origin?

Math  drwls, Tuesday, February 24, 2009 at 7:06am
That would be the product of the matrices of the two operations, done in that order. The first matrix changes x tp x, and leaves y and z the same. The second matrix changes x to x, y to y and z to z.
The product matrix leaves x unchanged and changes y to y and z to z.
The resulting matrix would seem to be
1...0...0
0.. 1..0
0...0..1
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