OAI.KirchbergRordam.GenericRW.FullSquareZero.exists_full_square_zero: intermediate lemma from OpenAI, The Kirchberg–Rørdam character criterion

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OAI.KirchbergRordam.GenericRW.FullSquareZero.exists_full_square_zero: intermediate lemma from OpenAI, The Kirchberg–Rørdam character criterion · Prove2Me