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- Thread starter Ted123
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CompuChip

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Well, [itex]\mathbb{R}[/itex] is open in [itex]\mathbb{R}[/itex], right?

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Well, [itex]\mathbb{R}[/itex] is open in [itex]\mathbb{R}[/itex], right?

So [itex]f(x)=x[/itex] is open

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