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Ultrafilter

math Maturity 11-13

We can group things together. We can pick a group of things. This group can be very special. It picks almost everything. It can also pick almost nothing. It helps us find a way to choose.

Filter vs ultrafilter 210div.svg
Filter vs ultrafilter 210div.svg
Do you like to pick groups?

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File:Filter vs ultrafilter_210div.svg
Filter vs ultrafilter_210div.svg
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