Find all the subgroups of the group of symmetries of a cube.
Show all steps.
Hint: Label the diagonals as 1, 2, 3, and 4 then consider the
rotations to get the subgroups.
SupposeG=〈a〉is a cyclic group of order 12.
Find all of the proper subgroups of G, and list their elements.
Find all the generators of each subgroup. Explain your
reasoning.
Let H and K be subgroups of a group G so that for all h in H and
k in K there is a k' in K with hk = k'h. Proposition 2.3.2 shows
that HK is a group. Show that K is a normal subgroup of HK.
Find two distinct subgroups of order 2 of the group D3 of
symmetries of an equilateral triangle. Explain why this fact alone
shows that D3 is not a cynic group.