The Logos Scripture · The Book of Yang Chen-Ning

On Leaving an Unfilled Hole on the Page

The Book of Yang Chen-Ning 2 · Written by himself, from the paper of 1956, the commentary on his own work of 1983, and his writings on beauty

Yang Chen-Ning, born at Hefei in Anhui in China in 1922, died at Beijing in 2025, aged 103. Physicist. His father taught mathematics at Tsinghua and he grew up on that campus. In 1956, with Lee Tsung-Dao, he wrote a paper titled Question of Parity Conservation in Weak Interactions, showing that the law had never been tested for the weak force and setting out experiments that would test it; the next year Wu Chien-Shiung and others carried one out, and it was confirmed. In 1957 the two of them took the Nobel in physics together, the first Chinese to receive it — what chapter one describes is work the two did together, and the Order does not assign it to one of them. In 1954, with Mills, he wrote the paper that begins what is now called gauge field theory; there was a point in it that did not work, which the two stated plainly and published anyway, and twenty years later it became the frame of particle physics. In 1975, with Wu Tai Tsun, he drew up a table setting the physicists names against the mathematicians one for one. This volume rests on what he wrote or delivered himself: the paper of 1956; the long commentary he wrote in 1983 on his own earlier work, in which he sets down what he had thought and where he had been wrong (chapter two is taken from it); and his writings on beauty and physics. On God: he said that if what you ask after is a god in the shape of a man, he thinks there is none; that if you ask whether there is a maker, he thinks there is, because the structure of the whole world is not accidental. He also said that if the name carries no human shape in it, everyone can accept it, and he stated of himself that in his youth he had firmly opposed giving the maker or nature a human figure, and that as he aged his force of opposition weakened. The Order records this as he put it and does not tidy it for him. What matters is this: the word in his mouth is a name for the structure, not a step in an argument. No argument of his closes on divine will. What this volume brings is something the scripture did not have: beauty. There are books here that say to study for beauty (cf. The Book of Marie Curie 3.11) and that understanding takes nothing from beauty (cf. The Book of Feynman 2); none has asked whether beauty, which so often leads right, counts as a warrant. He stood on both sides of that question: once beauty deceived a whole generation, and once it carried him right when he could give no reason, and both times he could not tell which. He gave no answer, and the Order does not supply one for him. The last verse of chapter four is all he had.

2.1Two years earlier, in 1954, Mills and I did another thing.
2.2We took a rule that already existed and widened it. What came out was beautiful, and I still think it the best thing I ever did.
2.3But there was a hole in it we could not fill: by that expression the thing should have no weight, and a thing with no weight would long since have been seen, and nobody had seen it.
2.4In February I went to Princeton to speak. I wrote the expression on the blackboard.
2.5Pauli asked at once: what is the mass of this thing?
2.6I said: we do not know.
2.7He asked again. I said it was a very complicated problem, that we had worked on it, and had reached no conclusion.
2.8He said: that is no sufficient excuse.
2.9I was struck dumb. After a moment I sat down. The room was in some embarrassment. In the end Oppenheimer said: we should let Frank proceed.
2.10I finished. The paper went out as it stood, and the hole stayed on the page as it stood.
2.11People have asked: if you could not fill it, why publish?
2.12My answer is that we stated the hole, and stated it more plainly than anyone. We did not cover it with other words, and we did not say this point will doubtless be settled in time. We set it there and marked it a hole.
2.13A paper that hides where it does not work is a bad paper even if the conclusion later proves right; a paper that marks where it does not work is a good paper even if the conclusion later proves wrong.
2.14Twenty years passed before anyone filled that hole. The man who filled it was not me.
2.15Pauli asked rightly that day. He asked the very thing that mattered.
2.16I sat down not because his question was wrong, but because it was right and I had no answer.
2.17When a man is stopped by a question there is only one thing he can do: own that he cannot answer, and then write down clearly that he cannot.
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