Displaying similar documents to “Natural deduction and coherence for non-symmetric linearly distributive categories.”

Finite sum-product logic.

Cockett, J.R.B., Seely, R.A.G. (2001)

Theory and Applications of Categories [electronic only]

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A TQFT for Wormhole cobordisms over the field of rational functions

Patrick Gilmer (1998)

Banach Center Publications

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We consider a cobordism category whose morphisms are punctured connected sums of S 1 × S 2 ’s (wormhole spaces) with embedded admissibly colored banded trivalent graphs. We define a TQFT on this cobordism category over the field of rational functions in an indeterminant A. For r large, we recover, by specializing A to a primitive 4rth root of unity, the Witten-Reshetikhin-Turaev TQFT restricted to links in wormhole spaces. Thus, for r large, the rth Witten-Reshetikhin-Turaev invariant of a link...

Structural analysis of social networks with respect to different levels of aggregation

Hans J. Hummell, Wolfgang Sodeur (1997)

Mathématiques et Sciences Humaines

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The article aims at the integration of the two research traditions of multi-level and of network analysis. To this effect, a strategy is presented which can be traced back to P.F. Lazarsfeld and H. Menzel's typology of units and of their properties. After having extended their classification to take account of more network concepts than was needed at their time, the Lazarsfeld-Menzel-Classification is used as a conceptual instrument to translate a research question, which first looks...