Displaying similar documents to “On directional cluster sets”

Reedy categories which encode the notion of category actions

Julia E. Bergner, Philip Hackney (2015)

Fundamenta Mathematicae

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We study a certain type of action of categories on categories and on operads. Using the structure of the categories Δ and Ω governing category and operad structures, respectively, we define categories which instead encode the structure of a category acting on a category, or a category acting on an operad. We prove that the former has the structure of an elegant Reedy category, whereas the latter has the structure of a generalized Reedy category. In particular, this approach gives a new...

Category bases.

Detlefsen, M., Szymański, Andrzej (1993)

International Journal of Mathematics and Mathematical Sciences

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Some results on projection of planar sets

Dilip Kumar Ganguly, M. Majumdar (1998)

Czechoslovak Mathematical Journal

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In this paper we define certain types of projections of planar sets and study some properties of such projections.