which ``almost everywhere'' looks like an ultrafilter has to be close to some fixed ultrafilter.
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Received: August 20, 1997
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Farah, I. Approximate Homomorphisms. Combinatorica 18, 335–348 (1998). https://doi.org/10.1007/PL00009826
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DOI: https://doi.org/10.1007/PL00009826