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Topic: Notation question
Replies: 1   Last Post: May 30, 2013 10:59 AM

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Robin Chapman

Posts: 412
Registered: 5/29/08
Re: Notation question
Posted: May 30, 2013 10:59 AM
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On 30/05/2013 15:41, Peter Percival wrote:
> Elsewhere I was asked if there is notation for "the subsets of X of
> cardinality k". I suggested [X]^k, which I have surely seen somewhere,
> but I can't remember where. What authoritative works can I cite?

Bollobas's lovely little book "Combinatorics" (CUP 1986)
uses X^{(k)} (in TeX notation).

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