Thanks for your replies.
Ranks of preferred notation for the size of a set S:
1. |S| (general "size of" operator e.g. vector norm, absolute
magniture, etc)
2. card(S) (cardinality, from pure maths).
3. n(S) ("from set theory", as in my original message).
|S| had by far the most votes and is quite intuitive. My choice.
Patrick.
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Professor Patrick Royston
Cancer Division
MRC Clinical Trials Unit
222 Euston Road
London NW1 2DA.
Phone: +44 207 670 4736
Fax: +44 207 670 4818
email: [log in to unmask]
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