Recentring: if the regular element `f` and the chart centre `g` (with division equivalence `Ec`) generate the same ideal modulo `π`, then the chart can be rescaled by a unit so that its new centre `g'

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Recentring: if the regular element `f` and the chart centre `g` (with division equivalence `Ec`) generate the same ideal modulo `π`, then the chart can be rescaled by a unit so that its new centre `g' · Prove2Me