Caspar Wessel
As surveying is related to mathematics, he later studied the geometrical importance of complex numbers. His most important paper, Om directionens analytiske betegning, (On the Analytical Representation of Direction) was published in 1799 by the Royal Danish Academy of Sciences and Letters. Since it was in Danish, it was not noticed by many people. Later, Jean-Robert Argand and Carl Friedrich Gauss's paper showed the same results.