Ideal correspondence for quotients

Ideals of R containing I are in bijection with ideals of the quotient ring R/I.
Ideal correspondence for quotients

Ideal correspondence for quotients: Let RR be a ring and let IRI\lhd R be a two-sided ideal, with quotient map π:RR/I\pi:R\to R/I. The assignment

JJ/I J\longmapsto J/I

is a bijection between two-sided ideals JRJ\lhd R with IJI\subseteq J and two-sided ideals of R/IR/I, with inverse Kπ1(K)K\mapsto \pi^{-1}(K). This correspondence preserves inclusion and carries sums and intersections to sums and intersections.

This is the ring form of the applied to the canonical π\pi, and it explains how in a lift and descend. In particular, and of R/IR/I correspond to those of RR that contain II (in the commutative setting).