Show that R is NOT isomorphic to R*. (R is real numbers and R* is the group of nonzero reals under multiplication)

Can someone show this. I can't even get started...

Thanks.

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- October 22nd 2012, 10:31 PMjzelltNot isomorphic
Show that R is NOT isomorphic to R*. (R is real numbers and R* is the group of nonzero reals under multiplication)

Can someone show this. I can't even get started...

Thanks. - October 23rd 2012, 12:06 AMFernandoRevillaRe: Not isomorphic