The array can be shown as 5 groups of 3 showing that 5 x 3 = 15. Or it could be shown as 3 groups of 5 showing that 3 x 5 = 15. This demonstrates that multiplication is commutative. Image caption, ...

Ultrafast chiroptical signals are notoriously difficult to image in space and time simultaneously. Now, multiplexed off-axis holography, which encodes polarization information, enables ultrafast ...