</ref> and the application of operator theory to quantum mechanics called [[von Neumann algebra]]. He was a member of the [[Manhattan Project]] who later worked with [[Edward Teller]] and [[Stanislaw Ulam]] to develop the steps for thermonuclear reactions necessary to build the hydrogen bomb. | </ref> and the application of operator theory to quantum mechanics called [[von Neumann algebra]]. He was a member of the [[Manhattan Project]] who later worked with [[Edward Teller]] and [[Stanislaw Ulam]] to develop the steps for thermonuclear reactions necessary to build the hydrogen bomb. |