Re: Not sure about interpretation of this set notation
- From: quasi <quasi@xxxxxxxx>
- Date: Wed, 21 Dec 2005 20:38:38 -0500
On 21 Dec 2005 17:22:56 -0800, "Kenneth Bull" <kenneth.bull@xxxxxxxxx>
wrote:
>
>X = { a /in B | a = 2k, k /in A }
>
>I am not sure about the k part. Does the above notation imply that
>"every k" in A must be considered (just like every a in B must be)?
Yes, all k's in A are potentially usable.
The notation is confusing since you are using a for an element of B,
and k for an element of A. I would change the letters for clarity:
X = { b /in B | b = 2a, a /in A}
Assuming division by 2 makes sense, here's another way to express X:
X = {b /in B | b/2 /in A}
quasi
.
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