thumb| is the group , the integers mod 8 under addition. The subgroup contains only 0 and 4. There are four left cosets of : itself, , , and (written using additive notation since this is the additive group). Together they partition the entire group into equal-size, non-overlapping sets. The index is 4.
thumb| is the group , the integers mod 8 under addition. The subgroup contains only 0 and 4 There are four left cosets of : itself, , , and (written using additive notation since this is the additive group). Together they partition the entire group into equal-size, non-overlapping sets. The index is 4.