## Commentaries
## INTERview: Hans Ohanian: A professor of physics explores the human failings of genius in a new book, Einstein窶冱 Mistakes.Posted: 2008-09-24
This is from The View, Sept. 24, 2005.
HANS OHANIAN: In the case of Einstein, the mistakes were necessary. He could not have arrived at some of his great pieces of work, such as special relativity and general relativity, without relying on mistakes that showed him a path towards a final result that was correct. Give an example. Whatﾃ｢冱 the most telling error
he made that gave him a shortcut to insight? To arrive at general relativity, Einstein took a shortcut through what is called the ﾃ｢徘rinciple of equivalence.ﾃ｢ He observed that behavior inside a freely falling elevator is as though gravity didnﾃ｢冲 exist. Things seem to float. So gravity and acceleration are equivalent. But that was a short cut, because itﾃ｢冱 not really true. Even in a freely falling elevator, with careful experiments, you can detect the presence of the gravitational field in which youﾃ｢决e falling. Einstein just ignored these little details ﾃ｢ and that permitted him to get to general relativity fairly quickly. Other people who might have approached the study of relativistic gravitation by a different track would have taken an extra 20 years to get to the same point. Is there embedded in what you say a skepticism
of the unique insights of genius? You seem to be saying Einstein was merely ahead of what would have been discovered anyway. I think that is generally true of science. In science, all discoveries ultimately get made. When a genius intervenes, it merely ensures that a discovery comes much earlier than it would have happened otherwise. In the case of Einstein, the discoveries he made would have been made anyhow within 10 or 20 years. As your book makes clear, not all his errors
were helpful or launched him toward new insights. Tell us about the various kinds of mistakes he made. Yes, his mistakes were of different characters. Some were just blunders in calculation. Those are in some sense the trivial errors. We all make mathematical errors, but I think Einstein was more prone to them than most. He was not a particularly good mathematician. He neglected his mathematical education in his studies at the University of Zurich, and he never made up for it. Instead, what he did throughout his life was hire assistants who would do calculations for him. He called them his Rechenpferde, his ﾃ｢彡alculating horses,ﾃ｢ a reference to Clever Hans, the horse that apparently could do arithmetical calculation by tapping its hoof. And there were more fundamental errors, conceptual errors in the basic ideas on which he based his theories, such as the example of the principle of equivalence. This mistake and a few others were ultimately productive, giving him the insight, for example, that in the presence of gravity, spacetime is curved. Without the mistake, he might never have arrived of such an outrageous ﾃ｢ but true ﾃ｢ idea. But he also made odd errors in logic. A good example of this is one of his attempted proofs at E= mcﾃつｲ where he proved that when you add some amount of energy to a system, the additional quantity satisfies the condition that E is equal to mcﾃつｲ for the increment you have added. But then he claimed that this means that what you had there originally has to also satisfy E= mcﾃつｲ. This is, of course, an absolute error in logic. But he believed it. He printed it in his papers, he printed it in a book he wrote about relativity; he never saw that this was just an absurd error in logic. According to the chronology you lay out in the
book, Einstein makes not just one mistake in his proof of E=mcﾃつｲ, but many. Yes, seven times. Every one of his attempted proofs went off the track somewhere. He did manage to prove E=mcﾃつｲ for a few specialized configurations, but he, of course, really wanted a general proof that E=mcﾃつｲ was always going to be valid. And he never managed to prove that. Why not?
To a large extent it was his poor mathematical background. It turned out that the solution of that problem hinged on using tensor mathematics, something Einstein was not familiar with until much later. He ultimately learned it when he needed it for general relativity but by that time other people had gotten ahead of him in their understanding of tensor mathematics and so they were able to produce the proof that he never managed. Did Einstein recognize his own errors?
Einstein recognized that theoreticians might make mistakes. He classified them in two ways: either errors in the basic concepts on which they base their theories ﾃ｢ they are led into these errors by the devil and we should pity the theoretician for that. And he said there are errors of mathematics and logic, and for these we should not pity the theoretician. Instead, we should give him a beating! Well, he made mistakes of both kinds, so sometimes we should pity him and sometimes we should give him a beating. Did Einsteinﾃ｢冱 contemporaries give him a
beating for his mistakes? By and large his contemporaries were very forgiving of these mathematical errors. I guess because they recognized the greatness of Einstein and they felt they shouldnﾃ｢冲 hold some mathematical errors or some slips in logic against him. But on his conceptual errors, yes, some of his contemporaries came down very hard on him, especially in the errors in connection with the unified theory of fields. Wolfgang Pauli, a Swiss physicist, for many years made fun of Einstein for the construction of his unified theories, because Pauli immediately recognized that these theories were totally mistaken and totally silly. Like many geniuses, Einstein had this period
of almost unbelievable productivity as a young man. 1905 is the year of miracles and within ten more his most important work had been done. And then he goes on for decades searching fruitlessly for this unified theory. I donﾃ｢冲 think that is terribly surprising. In the 1920s, when his productivity declined, he was in his early forties. Thatﾃ｢冱 a pretty old age for a theoretical physicist to make any more discoveries. There is an expression in physics: theoreticians suffer from Knabenphysik, physics of boys. They have to make their discoveries early ﾃ｢ or not at all. Einstein lasted longer than most. Einstein is famous in many ways. And one of
them, that you describe in the book, is that he is seen as being a person of mystical insight. What does mysticism mean in the world of physics? When I say that his approach to problem solving is that of a mystic, I simply mean that he didnﾃ｢冲 approach it through logical thinking, but came at it in an intuitive, visceral manner. He would just sit in a corner and think about it and then suddenly get an idea out of apparently nowhere. In that sense I describe him as having the habits of a mystic. He did rely greatly on what he thought was the beauty and compulsory nature of the ideas that came to him. That clearly has a mystical element to it. Why would you think that this or that idea is compulsory when you can offer no logical reason for that? I regard that as a mystical trait in Einsteinﾃ｢冱 thinking. Einstein, like many great thinkers,
presupposed that the world was knowable and ordered and in some way beautiful. But today we have a group of theorists, the string theorists, who have been failing for so many years that some of them are starting to say: maybe the world is not knowable or that the universe is capricious. I donﾃ｢冲 think thatﾃ｢冱 true. The string theorists of today are very much imitating Einstein in the sense that they want to construct theories on the basis of criteria of beauty and aesthetic qualities of the mathematical constructs that they are using. Which was exactly what Einstein tried to do with his unified theory and absolutely failed. I think the string theorists are failing in their unified theories for exactly the same reason: ultimately you canﾃ｢冲 construct a theory of the universe on the criteria of beauty and aesthetics alone. You also have to have solid experimental input. And Einstein failed with his aesthetic, mystical approach once he got to regions of physics where he had no experimental input anymore. And what is happening to the string theorists is exactly the same. They are failing because they are proceeding without using any experimental input. Is Einsteinﾃ｢冱 nearly saint-like status as the
greatest genius of physics justified? He made mistakes. He made stupid mistakes. We all make stupid mistakes. But as Paul Dirac, the famous British physicist, said, we have to judge a theoretical physicist not by the worst work he did, but by the best. And if you look at the best work of Einstein, it is of absolutely amazing quality, and he richly earned his reputation as the greatest genius of physics in the twentieth century. There is no question about that. Iﾃ｢囘 say he was the greatest genius of all time after Newton. Newton is the one physicist Iﾃ｢囘 place ahead of Einstein. If you wanted to make a list of the greatest geniuses of physics, Iﾃ｢囘 say Newton is at the top, Einstein is second. I would place Archimedes third and Galileo fourth. A key lens you use in the book is a
psychological one, a Freudian one: here is Einstein as rational theorist on one level and yet his greatest insights come from this unconscious realm. How did you try to illuminate this strange dark world of unconscious thought? That is the big puzzle. I have struggled and I canﾃ｢冲 say that I am satisfied with the level of understanding Iﾃ｢况e attained of Einsteinﾃ｢冱 thought processes and how he went about conceiving of these ideas. Maybe thatﾃ｢冱 just a general problem of dealing with genius ﾃ｢ ordinary persons canﾃ｢冲 understand how they do this! And maybe it is that all geniuses have some element of madness. So the honest biographer of genius is left at
the edge of darkness? In trying to understand the mental processes of these people, yes, the biographer is left confused. I doubt that we will ever understand how geniuses really operate. Einstein says he doesnﾃ｢冲 know how these ideas came to him; they just came. And he apparently was not able to explain this ultimate process of creation any better than anyone else. |

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