. . "Germanmathematician" . "1765-12-22Z"^^ . . . "1825-04-21Z"^^ . . . "Johann Friedrich Pfaff (sometimes spelled Friederich; 22 December 1765 \u2013 21 April 1825) was a German mathematician. He was described as one of Germany's most eminent mathematicians during the 19th century. He was a precursor of the German school of mathematical thinking, which under Carl Friedrich Gauss and his followers largely determined the lines on which mathematics developed during the nineteenth century."@en . . . . . . . . . "1765Z"^^ . "Pfaff, Johann Friedrich"@en . . . . . . "1825Z"^^ . . "Johann Friedrich Pfaff"@en .