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- In the mathematical field of analysis, a well-known theorem describes the set of discontinuities of a monotone real-valued function of a real variable; all discontinuities of such a (monotone) function are necessarily jump discontinuities and there are at most countably many of them. Usually, this theorem appears in literature without a name. It is called Froda's theorem in some recent works; in his 1929 dissertation, Alexandru Froda stated that the result was previously well-known and had provided his own elementary proof for the sake of convenience. Prior work on discontinuities had already been discussed in the 1875 memoir of the French mathematician Jean Gaston Darboux. (en)
- En analyse réelle, le théorème de Froda, redécouvert en 1929 par le mathématicien roumain Alexandru Froda mais dont des versions plus générales avaient été trouvées de 1907 à 1910 par Grace Chisholm Young et William Henry Young, assure que l'ensemble des points de discontinuité de première espèce d'une fonction réelle d'une variable réelle (définie sur un intervalle) est au plus dénombrable. (fr)
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- 28025 (xsd:nonNegativeInteger)
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- Proof that a jump function has zero derivative almost everywhere. (en)
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- En analyse réelle, le théorème de Froda, redécouvert en 1929 par le mathématicien roumain Alexandru Froda mais dont des versions plus générales avaient été trouvées de 1907 à 1910 par Grace Chisholm Young et William Henry Young, assure que l'ensemble des points de discontinuité de première espèce d'une fonction réelle d'une variable réelle (définie sur un intervalle) est au plus dénombrable. (fr)
- In the mathematical field of analysis, a well-known theorem describes the set of discontinuities of a monotone real-valued function of a real variable; all discontinuities of such a (monotone) function are necessarily jump discontinuities and there are at most countably many of them. (en)
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- Discontinuities of monotone functions (en)
- Théorème de Froda (fr)
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