Localizations of transfors

K-theory 28 (2003), 39-105

Abstract:

Let C, D and E be n-dimensional teisi, i.e., higher-dimensional Gray-categorical structures. The following questions can be asked. Does a left q-transfor C -> D, i.e., a functor 2q tensor C -> D, induce a right q-transfor C -> D, i.e., a functor C tensor 2q -> D? More generally, does a functor C tensor D -> E induce a functor D tensor C -> E? For k-arrows c and c' in C whose (k-1)-sources and targets agree, does a q-transfor C -> D induce a q-transfor C (c,c') -> D (d,d'), for appropriate k-arrows d and d' in D? For k-arrows c and c' in C and d and d' in D whose (k-1)-sources and targets agree, does a q-transfor C tensor D -> E induce a (q+k+1)-transfor C (c,c') tensor D (d,d') -> E (e,e'), for appropriate k-arrows e and e' in E? I give answers to these questions in the cases where n-dimensional teisi and their tensor product have been defined, i.e., for n <= 3, and for n up to 5 in some cases that do not need all data and axioms of n-dimensional teisi.

I apply the above to compositions in teisi, in particular to braidings and syllepses. One of the results is that a braiding on a monoidal 2-category induces a pseudo-natural transformation (? tensor -)~ -> ? tensor -, where (? tensor -)~ is the `reverse' of ? tensor -, whichis almost, but not quite, equal to - tensor ?. However, in higher dimensions tensor need not be reversible, so a braiding on a higher-dimensional tas can not be seen as a transfor A tensor B -> B tensor A.

``The author acknowledges the support of the Australian Research Council.
``© 2003 Kluwer Academic Publishers''

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Sjoerd E. Crans
School of Mathematics, Physics, Computing & Electronics
Macquarie University
NSW
Australia