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May 6 at 19:11 history edited Francesco Polizzi CC BY-SA 4.0
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May 6 at 18:59 history edited Francesco Polizzi CC BY-SA 4.0
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May 6 at 18:49 comment added Francesco Polizzi "Of course" in which sense? Osgood's theorem is about lines, so how could one guess that you were talking about germs? After your update, my answer looks wrong, while it was correct when I wrote it. I think you should have asked another question rather than updating yours after my answer was posted. Anyway, it does not matter...
May 6 at 17:08 comment added V. Rogov One can also assume that $X$ is algebraic and ask if it is true that $A \cap C$ is an algebraic subset of $C$ for an algebraic curve $C \subset X$ if and only if $A$ is an algebraic subvariety. But I guess this is a completely different question.
May 6 at 17:05 comment added V. Rogov Of course, I did not assume to test only on the closed curves. The question is local, so you can test on germs of curves (essentially on disks). I added an update to the post.
May 6 at 14:32 history edited Francesco Polizzi CC BY-SA 4.0
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May 6 at 14:27 history edited Francesco Polizzi CC BY-SA 4.0
added 484 characters in body
May 6 at 14:09 history answered Francesco Polizzi CC BY-SA 4.0