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Is R-Z(Real numbers - integers) an open topology?
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Is R-Z(Real numbers - integers) an open topology?

User Liam Kelly
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R−Z is a union of countable many open sets so R−ZR−Z is open
I actually didn't know that I had to look it up and got my answer from another site, oppsie doopsies

Is R-Z(Real numbers - integers) an open topology?-example-1
User Yenssen
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