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- Oct 5th 2010, 04:17 PM #1

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## What set is the set I?

I'm reading a book at the moment and it mentions a set but doesn't define what this set is. Is there a general meaning for this set ?

I'll post the context as it may be helpful

Let to be generated from where

Any help would be appreciated.

- Oct 5th 2010, 04:32 PM #2

- Oct 6th 2010, 04:25 AM #3

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There is absolutely to give a firm answer to your question.

I think that I is some arbitrary index set, as in: Consider a family of subsets of natural numbers . That's why the author must have forgotten to describe it.

- Oct 6th 2010, 05:32 AM #4
The (closed) unit interval is often denoted by , and from your context I feel this is most likely. That is, the set of real numbers between 0 and 1 inclusive, .

If not, my second guess would be an index set; I've never seen the complex numbers denoted by (although that doesn't rule it out).

Also, have you tried looking for a `notation' section in your book? They're often at the back with the index and references, or immediately after the contents.

- Oct 6th 2010, 06:19 AM #5

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- Oct 6th 2010, 06:41 AM #6

- Oct 6th 2010, 07:36 AM #7

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