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Feb 16, 2022 at 20:28 comment added Martin Argerami Neat trick! $\ \ $
Feb 16, 2022 at 20:28 comment added Andromeda Thanks both for the verification.
Feb 16, 2022 at 20:22 comment added Jamie Gabe Yes, I take it back by how I assumed he meant polarisation identity instead of polar decomposition. This is a neat trick.
Feb 16, 2022 at 20:21 comment added Matthew Daws Thanks! This seems good to me, and a new fact to file away...
Feb 16, 2022 at 20:08 history answered Andromeda CC BY-SA 4.0