Frobenius descent: `selectBlock` is a bijection from the residue cell of `residuePoly Φ ^ r` over `O` onto the block cell over `O[X]/(Φ)`, with inverse `descendBlock`;

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Frobenius descent: `selectBlock` is a bijection from the residue cell of `residuePoly Φ ^ r` over `O` onto the block cell over `O[X]/(Φ)`, with inverse `descendBlock`; · Prove2Me