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单词 SmallCategoryAlternative
释义

small category- alternative


Definition 0.1.

A (small) categoryMathworldPlanetmath 𝒞 consists of a set of objects C0 and a set of arrowsC1 together with the following structureMathworldPlanetmath:

  • a source map s:C1C0 assigning an object s(f) to each arrow fC1 ,

  • a target map: t:C1C0 assigning an object t(f) to each arrow fC1 ,

  • an identity map 1:C0C1 assigning to each object A an arrow 1A with

    s(1A)=t(1A)=A,
  • a composition map :C1×C1C1 assigning to each pair of arrowsf,g , such that

    s(g)=t(f)

    , a third arrow gf with s(gf)=s(f) and t(gf)=t(g).

  • The composition thus defined “” is associative, that is,

    h(gf)=(hg)f

    whenever these compositions make sense.

  • the identity map satisfies f1A=f for any f such thats(f)=A and 1Ag=g, and any g such that t(g)=A.

References

P. A. Zito. 2008. [arXiv: math.CT].http://arxiv.org/PS_cache/math/pdf/0509/0509266v1.pdf2-C* -Categories with non-simple units.,(Preprint).

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