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In topology, the Tietze extension theorem states that continuous functions on a closed subset of a normal topological space can be extended to the entire space, preserving boundedness if necessary.

Tietzes graph

In the mathematical field of graph theory, Tietze's graph is an undirected cubic graph with 12 vertices and 18 edges. It is named after Heinrich Franz Friedrich Tietze, who showed in 1910 that the Möbius strip can be subdivided into six regions that all touch each other – three along the boundary of the strip and three along its center line – and therefore that graphs that are embedded onto the Möbius strip may require six colors. The boundary segments of the regions of Tietze's subdivision form an embedding of Tietze's graph.

Tietze may refer to:

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Martin Tietze was a German luger who competed during the 1930s. He won seven medals at the European luge championships with five golds and two silvers. Tietze's four championships in the men's singles has not been equaled as of 2007.

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Karin Tietze is a retired East German slalom canoeist who competed in the mid-1950s. She won two medals at the 1955 ICF Canoe Slalom World Championships in Tacen with a gold in the folding K-1 team event and a silver in the folding K-1 event.

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Christopher Tietze was a United States physician best known for his stance in the United States pro-choice movement to permit abortion in the United States.

Erica Tietze-Conrat (born June 20, 1883 Vienna, died December 12, 1958, in New York City, also known as Erika Conrat, Erica Tietze) was an Austrian-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.

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Hans Tietze was an Austrian art historian and member of the Vienna School of Art History.

Extension theorem may refer to: