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SCHWEITZER 2010 Problem 10

    Consider the space {0,1}N\{0,1 \} ^{N} with the product topology (where {0,1}\{0,1 \} is a discrete space). Let T:{0,1}N→{0,1}NT: \{0,1 \} ^ {\mathbb {N}} \rightarrow \{0,1 \} ^ {\mathbb {N}} be the left-shift, ie (Tx)(n)=x(n+1)(Tx) (n) = x (n+1) for every n∈Nn \in \mathbb {N} . Can a finite number of Borel sets be given: B1,…,Bm⊂{0,1}NB_ {1}, \ldots, B_ {m} \subset \{0,1 \} ^ {N} such that {Ti(Bj)∣i∈N,1≤j≤m}\left \{T ^ {i} \left (B_ {j} \right) \mid i \in \mathbb {N}, 1 \leq j \leq m \right \} the σ\sigma -algebra generated by the set system coincides with the Borel set system?

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