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 2
q
C -> D, induce a right q-transfor C -> D, i.e., a functor C
2
q
-> D? More generally, does a functor C
D -> E induce a functor D
C -> E? For k-arrows c and c'
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'
D? For k-arrows c and c'
C and d and d'
D whose (k-1)-sources and targets agree, does a q-transfor C
D -> E induce a (q+k+1)-transfor C (c,c')
D (d,d') -> E (e,e'), for appropriate k-arrows e and e'
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 (?
-)
~
-> ?
-, where (?
-)
~
is the `reverse' of ?
-, whichis almost, but not quite, equal to -
?. However, in higher dimensions
need not be reversible, so a braiding on a higher-dimensional tas can
not
be seen as a transfor A
B -> B
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