"Beckmann, Petr"@en . . . . . "1924Z"^^ . "1993Z"^^ . . . . . "Petr Beckmann"@en . "1924-11-13Z"^^ . "Petr Beckmann (November 13, 1924 in Prague, Czechoslovakia \u2013 August 3, 1993 in Boulder, Colorado) was a professor of electrical engineering who became a well-known advocate of libertarianism and nuclear power. Later in his life he challenged Albert Einstein's theory of relativity and other accepted theories in modern physics."@en . . . "Physicist" . . "1993-08-03Z"^^ .