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Everything about Direct limit

Special case of colimit in category theory

In mathematics, a direct limit is a way to construct a object from many objects that are put together in a specific way. These objects may be groups, rings, vector spaces or in general objects from any category. The way they are put together is specified by a system of homomorphisms between those smaller objects. The direct limit of the objects, where ranges over some directed set, is denoted by. This notation suppresses the system of homomorphisms; however, the limit depends on the system of homomorphisms. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Direct limitA 5-minute orientation
  2. Skim a recent paper: Does foreign direct investment limit trade-adjusted carbon emissions: fresh evidence from global dataInfluential work since 2022
  3. Pick up a classic book: Financing a theatrical productionThe most-reprinted book on the subject
  4. Read the landmark paper: Direct Experimental Limit on Neutron–Mirror-Neutron OscillationsCited 83 times
  5. Go sideways: Inverse limitA closely related topic
  6. Go sideways: Limit (category theory)A closely related topic

šŸ“– Definitions

Noun A set of equivalence classes which partition the disjoint union of the members of a direct system; each equivalence class being a sort of ā€œdrainage basinā€ of the mappings (of the morphisms) of the direct system, if these are analogically considered as ā€œriversā€. (If i≤k, j≤k in the indexing poset, then there exist fik:Ai→Ak and fjk:Aj→Ak. If ai∈Ai, aj∈Aj such that fik(ai)=fjk(aj) then ai∼aj. If k = j then fjj(aj)=aj, fij(ai)=aj.)

Noun a colimit

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