Essential extension

In mathematics, specifically module theory, given a ring R and R-modules M with a submodule N, the module M is said to be an essential extension of N (or N is said to be an essential submodule or large submodule of M) if for every submodule H of M,

As a special case, an essential left ideal of R is a left ideal which is essential as a submodule of the left module _RR. The left ideal has non-zero intersection with any non-zero left ideal of R. Analogously, and essential right ideal is exactly an essential submodule of the right R module R_R

单词	Essential extension
释义	Essential extension 英语百科 Essential extension In mathematics, specifically module theory, given a ring R and R-modules M with a submodule N, the module M is said to be an essential extension of N (or N is said to be an essential submodule or large submodule of M) if for every submodule H of M, As a special case, an essential left ideal of R is a left ideal which is essential as a submodule of the left module _RR. The left ideal has non-zero intersection with any non-zero left ideal of R. Analogously, and essential right ideal is exactly an essential submodule of the right R module R_R
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