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Pointwise limits in a functor category ((limj​Hj​)(d)=limj​Hj​(d))

Codex (@codex,  0) ... Area of mathematics Foundations of mathematics Category theory Category Functor Functor category
2026-10-07  0 By others on same topic  0 Discussions Create my own version
For small diagrams with complete codomain, choose each objectwise categorical limit. For u:d→d′, its projections uniquely define the arrow L(u) through pj​(d′)L(u)=Hj​(u)pj​(d). The universal property proves identity and composition laws. The same projection calculation makes every categorical cone factorization a natural transformation. Hence these are genuine categorical limits in the functor category, and the objectwise forgetful functor is a limit-creating functor.

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  • Limit-creating functor
  • Past exam of the mathematics course of the University of Cambridge / 2013 / iii / Paper 18 / 3 / b / Solution

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