EINSTEIN, Albert (1879-1955). Typed letter signed ("A. Einstein") to Daniel M. Lipkin, Princeton, 5 July 1952. One page, 280 x 218mm, on Institute for Advanced Study letterhead with several autograph emendations including a hand-written equation. Einstein likens quantum theory to a "system of delusion of an exceedingly intelligent paranoiac concocted of incoherent elements of thought" . Einstein offers his counsel to Lipkin, an engineer and a former student of his friend David Bohm at Princeton on a set of equations he had sent for comment: "Your point of view to try to operate on the basis of certain lines analogous to the geodetical line seem to me not appropriate for reasons of principles. A relativistic theory of the total field should, according to my opinion, cannot admit singularities. Particles concentrated in a point can therefore not be used in such theory. For this reason I do not believe that any lines should play a fundamental role. The conviction that only solutions without any singularities can claim physical meaning creates a tremendous difficulty, because there are for non-linear differential equations—as far as I know—no methods to find them out systematically or even to find general theorems." He then offers a superb critique of quantum theory: "I too have many reasons to believe that the present quantum theory, inspite [ sic ] of its many successes, is far from the truth. This theory reminds me a little of the system of delusion of an exceedingly intelligent paranoiac concocted of incoherent elements of thought. As you also seem to believe I believe it impossible to get a real insight without satisfying from the start the principle of general relativity. I feel, however, by no means sure that my own approach is the right one." Einstein then references Lipkin's former professor: "I do also not believe that the de Broglie-Bohm's approach is very hopeful. It leads, f.i., to the consequence that a particle belonging to a standing wave has no speed. This is contrary to the well-founded conviction that a nearly free particle should approximately behave according to classical mechanics."
EINSTEIN, Albert (1879-1955). Typed letter signed ("A. Einstein") to Daniel M. Lipkin, Princeton, 5 July 1952. One page, 280 x 218mm, on Institute for Advanced Study letterhead with several autograph emendations including a hand-written equation. Einstein likens quantum theory to a "system of delusion of an exceedingly intelligent paranoiac concocted of incoherent elements of thought" . Einstein offers his counsel to Lipkin, an engineer and a former student of his friend David Bohm at Princeton on a set of equations he had sent for comment: "Your point of view to try to operate on the basis of certain lines analogous to the geodetical line seem to me not appropriate for reasons of principles. A relativistic theory of the total field should, according to my opinion, cannot admit singularities. Particles concentrated in a point can therefore not be used in such theory. For this reason I do not believe that any lines should play a fundamental role. The conviction that only solutions without any singularities can claim physical meaning creates a tremendous difficulty, because there are for non-linear differential equations—as far as I know—no methods to find them out systematically or even to find general theorems." He then offers a superb critique of quantum theory: "I too have many reasons to believe that the present quantum theory, inspite [ sic ] of its many successes, is far from the truth. This theory reminds me a little of the system of delusion of an exceedingly intelligent paranoiac concocted of incoherent elements of thought. As you also seem to believe I believe it impossible to get a real insight without satisfying from the start the principle of general relativity. I feel, however, by no means sure that my own approach is the right one." Einstein then references Lipkin's former professor: "I do also not believe that the de Broglie-Bohm's approach is very hopeful. It leads, f.i., to the consequence that a particle belonging to a standing wave has no speed. This is contrary to the well-founded conviction that a nearly free particle should approximately behave according to classical mechanics."
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