- #1
polarbears
- 23
- 0
Homework Statement
[tex](x_1 - x_2)(x_3 - x_4)[/tex]
Find permutations of subscripts that leave value unchanged
Homework Equations
The Attempt at a Solution
Okay so I know that it's asking how I should rearrange things and still not change the value.
Switching 1 with 2 or 3 with 4 would work but I know there's more than that but I'm don't know how to show it.
I guess I can expand it but I'm not sure if that helps