The abstract of the talk (see below) may be downloaded in one of the following formats:

Given a Boolean algebra $\B$ and an embedding $e:\B\longrightarrow\Pow\N/\Fin$,
we consider the possibility of extending each or some automorphism of $\B$ to
the whole $\Pow\N/\Fin$.
Among other things, we show that there are embeddings for which no
non-trivial automorphism can be extented.

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