Re: is C2xD5 isomorphe with D10?

In article <1118539195.358805.112950@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Rupert <rupertmccallum@xxxxxxxxx> wrote:
>Of course, presumably D5 is just C5,

No. The original poster specified that by "D5" he meant the dihedral
group of order 10.

There are two standard[1] notations for dihedral groups, both widely
used. There is one in which "Dn" is the plane symmetry group of the
regular n-gon, so Dn has 2n elements; the other is the one in which
"Dn" is the dihedral group of order n, so n is always assumed to be
even.


--
======================================================================
[1] The nice thing about standards is that there are so many
to choose from.
======================================================================

Arturo Magidin
magidin@xxxxxxxxxxxxxxxxx

.

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