This set of four matrices:(adsbygoogle = window.adsbygoogle || []).push({});

1 0 | 0 1 | -1 0 | 0 1

0 1 | 1 0 | 0 1 | -1 0

are closed under multiplication. What is it called? I know that it is not

those silly quaternions

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# What is this ring called?

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