Let G be the subgroup of R^3 consisting of all vectors of the form (x, y, 0). Let G act on R^3 by left multiplication. Describe the orbits of this G-action geometrically. Show that the set of orbits are in one to one correspondence with R
Answer: It is given that
The action of on is defined as
Now, for a fixed , the orbit of , by definition, is
which is same as the set
and geometrically it is the plane parallel to the plane and intersecting the axis at
Now, let be the set of all orbits of the action on and define as map as for any It follows from the computation of the last paragraph that is a well defined bijection and hence the set of orbits is in one to one correspondence wtih
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