Axel Sophus Guldberg (2 November 1838 – 28 February 1913) was a Norwegian mathematician.
[1][2][3] Born in Christiania (now called Oslo), Guldberg was the second oldest out of 11 siblings.
[4] He and his siblings were initially homeschooled, but he and his older brother, Cato Maximilian Guldberg, later began going to school in Fredrikstad, where they lived together with relatives.
[1][4] The same year, he began teaching mathematics at the Norwegian Military Academy until 1899.
[5] In 1866, he had a son, Alf Victor Guldberg, with his wife, Fredrikke Borchsenius.