I know the subgoups of the quaternion group (and that they are all normal), but i'm not sure how to determine the factor group Q8/N for each of the normal subgroups N.

Thanks for your help.

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- October 8th 2009, 04:43 AMLouiseFactor groups for the quaternion group?
I know the subgoups of the quaternion group (and that they are all normal), but i'm not sure how to determine the factor group Q8/N for each of the normal subgroups N.

Thanks for your help. - October 8th 2009, 05:08 AMNonCommAlg
- October 9th 2009, 01:25 AMLouise
How do you do the calculation Q8/{1,-1} to give {1,i,j,k}?

- October 9th 2009, 01:29 AMtonio
Q_8/{1,-1} is NOT {1,i,j,k} but the images of these elements in the factor group, just Noncommalg denoted by putting a bar over the elements i,j,k.

Why is this thing isomorphic with Z_2 x Z_2? Well, check that any of the elements 1, i, j, k squared gives you an element in {1,-1}...

Tonio