. "John, Fritz"@en . . "1994Z"^^ . . . "1910Z"^^ . . "mathematician" . "Fritz John"@en . . . . . . . "1910-06-14Z"^^ . . "1994-02-10Z"^^ . "Fritz John (14 June 1910 \u2013 10 February 1994) was a German-born mathematician specialising in partial differential equations and ill-posed problems. His early work was on the Radon transform and he is remembered for John's equation."@en . . . . . .