Theodor Haagaas
Theodor Christian Petersen Haagaas (15 June 1873, Tistedalen – 25 December 1961, Oslo) was a Norwegian mathematician and private school owner. He was a co-owner of Frogner School and Nissen's Girls' School (1913–1918) and founder, owner and headmaster 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. He received the King's Medal of Merit in Gold in 1949. Background He grew up in Tistedalen outside Frederikshald, where his father Theodor Christian Haagaas (1823–1899) was the managing director (1862–1892) of the sawmills of Saugbrugsforeningen, Norway's largest timber company. His father lived at Veden Manor in Tistedalen. Theodor Haagaas was one of the pioneers of skiing in Tistedalen around 1885–1886. He was the father of four daughters, among them Henriette Bie Lorent ...
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Tistedalen
Tistedalen is a part of Halden in Østfold Østfold is a traditional region, a former county and a current electoral district in southeastern Norway. It borders Akershus and southwestern Sweden (Västra Götaland County and Värmland), while Buskerud and Vestfold are on the other side o ..., Norway. Originally located four kilometers from the city center, the area started growing up around the sawmill indu