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In the book, Lectures on tensor categories and modular functors by Bakalov and Kirillov they construct a TQFT.

When they come to prove the gluing axiom, they just mention that "...This statement is of purely topological nature, and we omit its proof." And I don't see how to prove it.

Basically, they claim that if we cancel two coupons of a special link we get the same manifold via surgery. (See the picture from page 87 of the book)

Could someone provide me a proof of the gluing axiom or give me a reference containing a complete proof? I read a Turaev's book but that proof is also not easy to understand.

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    The gluing axiom is an axiom. What example are you trying to verify it for?2012-10-11
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    They construct Turaev-Reshetikhin TQFT and show that the construction satisfies the axiom of TQFT.2012-10-11

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