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Exact large ideals of B(G) are downward directed

We prove that if E and F are large ideals of B(G) for which the associated coaction functors are exact, then the same is true for the intersection of E and F. We also give an example of a coaction functor whose restriction to the maximal coactions does not come from any large ideal.

preprint2016arXivOpen access
S. KaliszewskiMagnus B. LandstadJohn Quigg
math.OA
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S. KaliszewskiMagnus B. LandstadJohn Quigg

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