In a hand out I saw the a notation which looks to be the absolute value of a sigma field F, |F|. I googled it but I could not really find what it means and the notation confuses me. Anyone that might enlighten me of the meaning of this?
2026-04-03 06:06:40.1775196400
Meaning of abs. value of a sigma field?
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The notation $|F|$ refers to the cardinality of the field. See https://en.wikipedia.org/wiki/Cardinality.