Isomorphism between [0,1] to (0,1) I need to find an isomorphism between [0,1] to (0,1) can you help me with this please?
thanks. benny

What do you mean by "isomorphism"? Are you considering these sets with a given group or ring structure (if then, which one?), or as topological spaces (in which case you'd be looking for a "homeomorphism"), or just as sets?
I don't know of a canonical group structure on either set, but if you want your map between the two to be continuous you might have some luck by looking at the notion of compactness and how it behaves under continuous functions.
