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The "example" in the text isn't an example: the projection of the hyperbola xy=1 is certainly an open subset of A^1. (This is the standard example to show that the image of a
Zariski-closed set needn't be Zariski-closed, but that's not relevant here.)
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I'll fix it when I get the chance; if any watchers want to do so in the meantime, please have at it!
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