Tietze (surname)

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Tietze may refer to:

Tieze

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Heinrich Franz Friedrich Tietze Austrian mathematician

Heinrich Franz Friedrich Tietze was an Austrian mathematician, famous for the Tietze extension theorem on functions from topological spaces to the real numbers. He also developed the Tietze transformations for group presentations, and was the first to pose the group isomorphism problem. Tietze's graph is also named after him; it describes the boundaries of a subdivision of the Möbius strip into six mutually-adjacent regions, found by Tietze as part of an extension of the four color theorem to non-orientable surfaces.

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Erica Tietze-Conrat (née Erika Conrat, also known as Erica Tietze; born June 20, 1883 – died December 12, 1958) was an Austrian-born American art historian, one of the first women to study art history, a strong supporter of contemporary art in Vienna and an art historian specializing in Renaissance art and the Venetian school drawings.