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Sigve Tjøtta (born 1 March 1930) is a Norwegian mathematician.

He was born in Kleppmarker. He took the cand.real. degree in 1954 and the dr.philos. degree in 1960, both at the University of Oslomarker. His doctoral thesis was On Some Non-linear Effects in Sound Fields, with Special Emphasis on the Generation of Vorticity and the Formation of Streaming Patterns. He worked as a research assistant in Oslo from 1954 to 1956, 1957 to 1958 and 1959 to 1960. In between he studied at Brown Universitymarker from 1956 to 1957 and at the Max Planck Institute. Among his advisors were Johan Peter Holtsmark.

He was appointed docent at the University of Bergenmarker in 1960, and was promoted to professor in 1963. He succeeded Oddvar Bjørgum, and had responsibility for the university's education in applied mathematics. His fields of research include plasma, nonlinear acoustics, hydroacoustics and acoustic streaming. He was also the dean of the Faculty of Mathematics and Natural Sciences from 1975 to 1977, and has held positions in NAVF, NTVF, and in the national committee of the International Union of Theoretical and Applied Mechanics. He has also been a visiting scholar at the University of Texasmarker.

Tjøtta married Jacqueline Naze, a colleague, in 1964—they barely survived a car crash sustained on their honeymoon. They have since done extensive research together. After retirement from the professor chair, the couple moved to Oslomarker.

Together with his wife, Tjøtta won a prize in underwater acoustics from the French Academy of Sciences. He is a fellow of the Acoustical Society of America, and a member of the Norwegian Academy of Science and Letters. In 2002 he was decorated as a Knight, First Class of the Royal Norwegian Order of St. Olav.

Tjøtta's most prominent hobby is long-distance running. He discovered his talent during a stay in the United States, where jogging was popular. He ran the marathon in 3:17.02 hours at the age of 66, and the half marathon in 1:43.09 hours at the age of 75.

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