§47.2 “Essential surjections and injections¶
The Stacks Project. §47.2 “Essential surjections and injections.
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Domain-specific¶
- Essential Extension
- The property belongs to the inclusion, not to $N$ or $M$ in isolation: the same module can be essential in one ambient module and nonessential in another.
This sourceOriginal collaborative mathematics reference for the intersection definition, elementwise criterion, transitivity and restriction.
- The property belongs to the inclusion, not to $N$ or $M$ in isolation: the same module can be essential in one ambient module and nonessential in another.
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