# Math Help - what would it mean by .................................

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

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

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

3. 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.

4. 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

If it is, do you understand what a cross product is?
If it is not about cross product, then what is it about?

6. Originally Posted by Plato