In 1843 he taught in Deutsch Krone in West Prussia, and from 1848 he taught at the Lyceum Hosianum in Braunsberg. Besides mathematics, he also taught physics, botany, and gymnastics. At some point, Weierstrass may have had an illegitimate child ("Franz") with the widow of his friend Carl Wilhelm Borchardt.
In 1843 he taught in Deutsch Krone in West Prussia and from 1848 he taught at the Lyceum Hosianum in Braunsberg Besides mathematics, he also taught physics, botany, and gymnastics. At some point, Weierstrass may have had an illegitimate child ("Franz") with the widow of his friend Carl Wilhelm Borchardt.