Gareth (chilledglove) wrote in quants,
Gareth
chilledglove
quants

fields

I was just reading something this morning, and I ran into a problem.

One of the conditions for a collection to be a field is that the collection is closed under union...but I can't see why this would ever not be the case. Could someone give me an example of a collection of sets that isn't closed under union?
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