226 unambiguous.)

   226 unambiguous.)

   227 We have $\deg(p'') = 0$ and, inductively, $f'' = p''(b'')$.

   227 We have $\deg(p'') = 0$ and, inductively, $f'' = p''(b'')$.

   228 %We also have that $\deg(b'') = 0 = \deg(p'')$.

   228 %We also have that $\deg(b'') = 0 = \deg(p'')$.

   229 Choose $x' \in \bc_*(p(V))$ such that $\bd x' = f'$.

   229 Choose $x' \in \bc_*(p(V))$ such that $\bd x' = f'$.

   230 This is possible by Properties \ref{property:disjoint-union} and \ref{property:contractibility}  and the fact that isotopic fields

   230 This is possible by Properties \ref{property:disjoint-union} and \ref{property:contractibility}  and the fact that isotopic fields

   232 Finally, define

   232 Finally, define

   233 \[

   233 \[

   234 	e(p\ot b) \deq x' \bullet p''(b'') .

   234 	e(p\ot b) \deq x' \bullet p''(b'') .

   235 \]

   235 \]

   236 

   236