Flat module

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Notion

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Science and technology

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What Wikipedia says

In algebra, flat modules include free modules, projective modules, and, over a principal ideal domain, torsion-free modules. Formally, a module M over a ring R is flat if taking the tensor product over R with M preserves exact sequences.

Excerpt from the Wikipedia article “Flat module”, under the CC BY-SA 4.0 license. Read the article on Wikipedia