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corrected title according to OP comment

edited Sep 30, 2020 at 7:59

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How to give a Borel set whose projection is not 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 descriptive-set-theory

asked Sep 28, 2020 at 12:49

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