Abstract
Every student of topology has heard of filters: If I is a nonempty set, a filter is a set F of subsets of I such that:
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I ∈ F, Ø ∉ F;
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if X, Y ∈ F then X ∩ Y ∈ F
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if X ∈ F and X ⊂ Y, then Y ∈ F.
Et por l’achaison de celle bataille et de celle ghere nulo home ne pooit aler per chemin qui ne fust pris: et ce estoit deverç dont il estoient venu ; mes avant pooient il bien aler. Et adonc les deus frers distroient entr’aus “puis que nos ne poons retorner a Gostantinople con notre mercandie, or alon por la voie dou levant ...
M.P.
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© 2000 Springer Science+Business Media New York
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Poizat, B. (2000). Compactness. In: A Course in Model Theory. Universitext. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8622-1_4
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DOI: https://doi.org/10.1007/978-1-4419-8622-1_4
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