Theodor Haagaas
(1873-1961)
Norwegian mathematician and private school owner
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Theodor Christian Petersen Haagaas (15 June 1873, Tistedalen – 25 December 1961, Oslo) was a Norwegian mathematician, private school owner and author. He was a co-owner of Frogner School and Nissen's Girls' School (1913–1918) and founder and owner of the Haagaas School, a private gymnasium at Frogner, Oslo that existed 1915–1955. He is also known for the widely used Haffner og Haagaas series of textbooks in mathematics, which was published between 1925 and 1979 in numerous editions.
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