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May 14, 2019 at 8:26 vote accept Doriano Brogioli
May 13, 2019 at 18:05 comment added Igor Khavkine @DorianoBrogioli, I agree that it's essentially the same argument. The block calculation helped me see how to find the kernel of the $S$ matrix; that is all.
May 13, 2019 at 12:50 comment added Doriano Brogioli Taking inspiration from the comment of @NathanielJohnston, maybe it is possible to simplify the proof removing the initial part with the calculation with blocks.
May 13, 2019 at 11:07 history answered Igor Khavkine CC BY-SA 4.0