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Extendability and almost continuity. (English) Zbl 0843.26002

Summary: Every function \(f: [0, 1]\to [- 1, 1]\) can be expressed as the sum of three extendable functions, as the maximum of two minima of extendable functions and as the limit of a transfinite sequence of extendable functions.

MSC:

26A15 Continuity and related questions (modulus of continuity, semicontinuity, discontinuities, etc.) for real functions in one variable
54C08 Weak and generalized continuity