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| Title: | Mathematics at DEC |
|
| Moderator: | RUSURE::EDP |
|
| Created: | Mon Feb 03 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2083 |
| Total number of notes: | 14613 |
Hi,
My friends asked me the following and I got no idea to solve it. So
I need some help. The problem is :
There are two sets x and y
x = {0, 1, 2} X {0, 1, 2, 3, 4} X {0, 1, 2, ..., 6}
y = {0, 1, 2, 3, ..., 104}
Now, there is an operator || such that
|x | = |y |
What is this operator || ?
Can anyone help me ? Thank you
-- Joseph
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1496.1 | | UNTADC::TOWERS | | Tue Sep 24 1991 06:54 | 5 |
| There are 3x5x7 = 105 elements in set X and 105 elements in set Y.
|X| is the number of elements in set X.
Brian
|
| 1496.2 | another possibility | CORREO::BELDIN_R | Pull us together, not apart | Tue Sep 24 1991 10:11 | 1 |
| Or a linearization mapping.
|
| 1496.3 | | HANNAH::OSMAN | see HANNAH::IGLOO$:[OSMAN]ERIC.VT240 | Thu Sep 26 1991 16:54 | 14 |
| This seems like one of those ill-defined-not-thought-out problems that
should be take out and shot.
The first digit in each set is "0" so why can't an answer be
|S| = first-digit appearing in first element of the set
For that matter, why can't we just say
|S| = 7
That definition certainly produces the same value for sets X and Y, namely
7.
|
| 1496.4 | | VAXRT::BRIDGEWATER | Eclipsing the past | Fri Sep 27 1991 13:41 | 9 |
| >The first digit in each set is "0" so why can't an answer be
>
> |S| = first-digit appearing in first element of the set
Sets are usually not taken to be ordered sets unless stated explicitly.
However, I agree with you that this problem is not well-defined.
- Don
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| 1496.5 | trivia comment | STAR::ABBASI | | Fri Sep 27 1991 14:22 | 1 |
| if a set is ordered, it is called a list.
|