離散圏
圏論において離散圏(英:en:Discrete_category)とは非自明な射を全く持たない圏である.
つまり, 圏 が離散であるとは, の任意の異なる対象 に対し, が空集合となり, が恒等射のみからなるときをいう.
参考文献
- Robert Goldblatt (1984). Topoi, the Categorial Analysis of Logic (Studies in logic and the foundations of mathematics, 98). North-Holland. Reprinted 2006 by Dover Publications, and available online at Robert Goldblatt's homepage.
- http://www.math.nagoya-u.ac.jp/~hasimoto/paper/class/cat10.pdf
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