# what would it mean by .................................

• Apr 24th 2010, 04:10 AM
npm1
what would it mean by .................................
|A * A|....... A={12,13,1,2,7}...........................
what does this line mean|.................................
• Apr 24th 2010, 04:18 AM
Tekken
Quote:

Originally Posted by npm1
|A * A|....... A={12,13,1,2,7}...........................
what does this line mean|.................................

The determinant.
• Apr 24th 2010, 05:04 AM
Plato
Quote:

Originally Posted by npm1
|A * A|....... A={12,13,1,2,7}...........................
what does this line mean|.....................

Is the question about $|A\times A|?$
If it is then that stands for the number of pairs in the cross product of $A$ with itself.
• Apr 24th 2010, 05:11 AM
npm1
Quote:

Originally Posted by Plato
Is the question about $|A\times A|?$
If it is then that stands for the number of pairs in the cross product of $A$ with itself.

would the product be ......
12.12|13.13|1.12|
12.13|13.12|1.13|
12.1|13.1|1.1|
12.2|13.2|1.2|
12.7|13.7|1.7|.........etc then add all that up
• Apr 24th 2010, 05:16 AM
Plato
If it is, do you understand what a cross product is?
If it is not about cross product, then what is it about?
• Apr 24th 2010, 05:43 AM
npm1
Quote:

Originally Posted by Plato
If it is, do you understand what a cross product is?
If it is not about cross product, then what is it about?

the question is aswking this
determine the value of this expression
it also says that |X| denotes the number of elements in X.
• Apr 24th 2010, 05:48 AM
Plato
Quote:

Originally Posted by npm1
the question is aswking this
determine the value of this expression
it also says that |X| denotes the number of elements in X.

Please stop sending PMs to me.