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Nov 7, 2023 at 13:06 comment added Nathaniel Johnston For what it's worth, the matrices in $S$ are said to be "principally nonsingular", which leads to some papers via Googling.
Nov 6, 2023 at 16:10 history edited Qixian Zhao CC BY-SA 4.0
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Nov 6, 2023 at 16:02 history edited Qixian Zhao CC BY-SA 4.0
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Nov 6, 2023 at 15:05 history asked Qixian Zhao CC BY-SA 4.0