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Jan 11, 2017 at 14:57 history edited Yemon Choi CC BY-SA 3.0
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Jan 11, 2017 at 14:54 comment added Yemon Choi @AliTaghavi Well that is why I was assuming you were working with continuous homomorphisms. I agree that in general it is not obvious if a homomorphism defined on $C([0,1])$ is continuous (the Dales-Esterle counterexamples to Kaplansky's question) but in the present case we may be able to say more. Let me think about this; I retract my earlier comment on your original question.
Jan 11, 2017 at 14:25 comment added Ali Taghavi Is it obvious that the kernel of $C([0 1]) \to W$ is closed?
Jan 11, 2017 at 14:20 comment added Yemon Choi You mean $W$, right? I assumed you were only interested in continuous algebra homomorphisms, and then every closed ideal in $C(X)$ is given by the functions vanishing on some open subset $U$
Jan 11, 2017 at 14:02 comment added Ali Taghavi R is just a ring not necessarily a c* algebra
Jan 11, 2017 at 13:21 history answered Yemon Choi CC BY-SA 3.0