scientific article; zbMATH DE number 3326338

zbMath0205.26803MaRDI QIDQ5605137

K. Kuratowski

Publication date: 1970

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

Mathematics Subject Classification ID

Set-valued maps in general topology (54C60) Weak and generalized continuity (54C08)

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A topological version of Hilbert's Nullstellensatz ⋮ On the Borel class of the derived set operator. II ⋮ On the Borel class of the derived set operator ⋮ Index sets for \(\Pi^0_1\) classes ⋮ A NOTE ON SEMI-CONTINUOUS SET-VALUED FUNCTIONS

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