At 8:30, for the 6th row, why didn't we added 6 and not 5 to 0 to make it {0,5}.....(like we did in the previous rows adding 0,1,2,3,4). Please tell as I have an exam.
I know this late but it’s because the order a subgroup has to divide the order of the GROUP G, for example 5 doesn’t divide into 12 so we can’t have a group with order 5, also look how 0,1,2,3,4, 6 all divide into 12 leaving only integer solutions
