1136 \begin{equation*}

  1136 \begin{equation*}

  1137 	\hom_A(\bc_*(M), \bc_*(N)) \ot \bc_*(M) \ot_A \bc_*(R) \to \bc_*(N) \ot_A \bc_*(R) .

  1137 	\hom_A(\bc_*(M), \bc_*(N)) \ot \bc_*(M) \ot_A \bc_*(R) \to \bc_*(N) \ot_A \bc_*(R) .

  1138 \end{equation*}

  1138 \end{equation*}

  1139 We think of this map as being associated to a surgery which cuts $M$ out of $M\cup_E R$ and

  1139 We think of this map as being associated to a surgery which cuts $M$ out of $M\cup_E R$ and

  1140 replaces it with $N$, yielding $N\cup_E R$.

  1140 replaces it with $N$, yielding $N\cup_E R$.

  1142 which share a common boundary.)

  1142 which share a common boundary.)

  1143 In analogy to Hochschild cochains, we will call elements of $\hom_A(\bc_*(M), \bc_*(N))$ ``blob cochains".

  1143 In analogy to Hochschild cochains, we will call elements of $\hom_A(\bc_*(M), \bc_*(N))$ ``blob cochains".

  1144 

  1144 

  1145 Recall (Theorem \ref{thm:evaluation}) that chains on the space of mapping cylinders also act on the 

  1145 Recall (Theorem \ref{thm:evaluation}) that chains on the space of mapping cylinders also act on the 

  1146 blob complex.

  1146 blob complex.