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corrected title according to OP comment

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edited Sep 30, 2020 at 7:59

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How to give a Borel set whose projection is not Borel?

edited tags; edited title

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edited Sep 30, 2020 at 6:18

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How to give an analytic set which is not a Borel set but whose projection is Borel?

real-analysis measure-theory descriptive-set-theory

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asked Sep 28, 2020 at 12:49

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How to give an analytic set which is not a Borel set but whose projection is Borel?

I wonder that how Suslin got the idea "analytic set" and the advanced knowledge in this field.

Can anyone explain this simply or recommend some reference?

All discussions and comments are welcome.

real-analysis measure-theory descriptive-set-theory