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Jan 4, 2021 at 14:11 comment added Sasha Ups, I missed this condition (thought it is about matrices over $A$).
Jan 4, 2021 at 4:36 comment added LSpice Why is this lifting given by matrices over $k$, as required in the question?
Jan 4, 2021 at 4:26 history answered Sasha CC BY-SA 4.0