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 Nov24 comment What are some good intuitions for understanding Souslin's operation $\mathcal{A}$? Dear Matt, I decided to invest my own reputation into a bounty since it would make feel bad to accept your very generous offer. Thanks a lot once again! Nov24 awarded Promoter Oct30 comment What are some good intuitions for understanding Souslin's operation $\mathcal{A}$? Dear Matt N. Thank you so much for your kindness! I am not too fast when it comes to learning new points of view, hence I will need a few days to find out whether this pointer to recursion theory is completely satisfactory. I am still hoping for some more input. Thanks again for your interest. Best wishes, Oct30 awarded Nice Question Oct30 awarded Revival Oct29 revised Some examples in C* algebras and Banach * algebras deleted 17 characters in body Oct29 comment What are some good intuitions for understanding Souslin's operation $\mathcal{A}$? Thank you for your answer. Concerning the historical note at the end of the first paragraph: This is precisely the paper of Souslin I linked to, see the paragraph after Théorème V where Souslin points out the error by Lebesgue: "cette démonstration doit, par suite, être modifiée" (this proof must, therefore, be modified). Most of the results in Jech are already in the two notes by Souslin and Lusin. The pointer to Marker's notes looks very promising, I was unaware of this description of analytic sets, thank you very much! Oct29 comment What are some good intuitions for understanding Souslin's operation $\mathcal{A}$? Thank you, that's very kind of you! I just received a message that I earned that privilege, so I will be able to put one myself. I hope it will work out. Oct29 revised What are some good intuitions for understanding Souslin's operation $\mathcal{A}$? some typos Oct29 awarded Editor Oct29 revised Some examples in C* algebras and Banach * algebras reorganized text, threw out some clutter Oct29 awarded Teacher Oct29 answered Some examples in C* algebras and Banach * algebras Oct28 asked What are some good intuitions for understanding Souslin's operation $\mathcal{A}$? Aug8 comment If the unit sphere of a normed space is homogeneous is the space an inner product space? @mixedmath: thank you very much for your help and the welcome! Having registered my account, I expect no further trouble with lost cookies :-) Sorry for the inconvenience. Aug8 awarded Scholar Aug8 awarded Supporter Aug8 accepted If the unit sphere of a normed space is homogeneous is the space an inner product space? Aug8 awarded Student Aug7 comment If the unit sphere of a normed space is homogeneous is the space an inner product space? Thank you very much for this very interesting and helpful information, I wasn't aware that this was a well-known problem!