because of easiness of calculation without affecting the result to considerable extent....
Oppenheimer's notable achievements in physics include the Born-Oppenheimer approximation for molecular wavefunctions, work on the theory of electrons and positrons, the Oppenheimer-Phillips process in nuclear fusion, and the first prediction of quantum tunneling.
Ruben Oppenheimer was born in 1975.
Damon Oppenheimer was born in 1962.
Andrés Oppenheimer was born in 1951.
Stephen Oppenheimer was born in 1947.
Joshua Oppenheimer was born in 1974.
Ernest Oppenheimer was born in 1880.
Lillian Oppenheimer was born in 1898.
Bernard Oppenheimer was born in 1866.
Alan Oppenheimer was born on April 23, 1930.
Hillel Oppenheimer was born on April 4, 1899.
Franz Oppenheimer was born on March 30, 1864.