- #1
pellman
- 684
- 5
It is an X like in a cross product but with a vertical line connecting upper-left and lower-left endpoints. I will write it as |X . Example context:
R^4 |X SL(2,C)
where the R and C are real numbers and complex numbers.
R^4 |X SL(2,C)
where the R and C are real numbers and complex numbers.