Christian Juel

From 1876 he studied mathematics at the University of Copenhagen; there he received In 1879 his undergraduate degree in mathematics and in 1885 his Ph.D. (promotion) with thesis Inledning i de imaginaer linies og den imaginaer plans geometrie.

Juel did research on projective geometry, algebraic curves, polyhedra, and surfaces of revolution from ovals.

In addition to a monograph on projective geometry, Juel wrote textbooks dealing with stereometry, rational mechanics, and introductory mathematics for chemists.

In 1928 he was an invited speaker at the International Congress of Mathematicians at Bologna and gave a talk Beispiele von Elementarkurven und Elementarflächen.

[3] His wife's father was the mathematician and astronomer Thorvald Nicolai Thiele.