1 Changes between arXiv version 2 and arXiv version 3

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     3 

     4 Many small clarifications of text.  

     5 

     6 Also many typos corrected.

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     8 The most significant changes are:

     9 

    10 - added to acknowledgements

    11 - clarified definition of splittable

    12 - change to pitchfork notation for splittable subsets of fields

    13 - added definition of collaring homeomorphism

    14 - improved definition of bordism n-category

    15 - fixed definition of a refinement of a ball decomposition (intermediate manifolds should also be disjoiunt unions of balls)

    16 - added brief defintion of monoidal n-categories

    17 - fixed statement of compatibility of product morphisms with gluing

    18 -