I once read that, in the case of most scientific discoveries, if they hadn't been made when they were, and by who they were, the same discovery would have been made by someone else. Is this true? I also read that Einstein's general and special theories of relativity were such an original contribution that if he hadn't come up with them we would still be waiting for them. Do you think that's the case? What about philosophy? Are there determinate structures of thought which philosophers are just uncovering, or is theorising a significantly creative act?

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I have heard this said as well. In the history of science, there are many examples in which several researchers independently came up with the same new idea. Schrodinger and Heisenberg independently came up with the same theory (quantum mechanics) and presented it in such different forms that someone else (Born) had to figure out that they were equivalent. Darwin and Wallace (both from reading Malthus!) independently came up with the theory of natural selection. Adams and LeVerrier independently predicted the existence of the planet Neptune. Lavoisier and Priestley independently discovered oxygen. The examples are legion. These cases of simultaneous discovery are good evidence that once a problem reaches a certain point, it is widely recognized as a problem and the same solution would soon have been found even if the actual discoverer had not found it.

Einstein's theories of special and general relativity are sometimes cited as exceptions to this general rule. One reason for this view is that the "problem" as Einstein saw it was not widely recognized. Of course, many scientists knew of the Michelson-Morley experiment and realized that it was an anomaly that had to be dealt with somehow. But Einstein was motivated to develop relativity not primarily by experimental results that needed to be explained, but rather by an "asymmetry" in Maxwell's electromagnetic theory. (See the majestic opening paragraph of his 1905 relativity paper for the "asymmetry" argument.) This "asymmetry" was widely known, but very few besides Einstein regarded it as a problem of any kind.

Another reason for the view that relativity would not have been found without Einstein is that relativity was not a modest solution to a narrowly confined problem. Rather, relativity was a sharp break from all of the physics that had gone before. It dispensed with absolute time, space, and motion -- the conceptual framework of Newtonian physics as it was then understood. It is therefore more difficult to say in the case of relativity that it would still have been discovered at about the same time, had Einstein not been there to do it.

Unlike scientific theories, Bach's "Goldberg Variations" and Eliot's "Middlemarch" would not still have been created, had Bach or Eliot not existed. What's the status of philosophical ideas? In general, I am inclined to think that philosophy is a discipline in pursuit of truth, like science. Although philosophers (unlike scientists) still derive insights from reading works written many generations ago, philosophy involves giving arguments that others could (and probably would) have discovered. After all, one can give the "basic idea" behind some philosophical theory or argument. Its most valuable elements be summarized, put into other words, extracted from its context and its other elements. In this respect, a philosophical work is unlike a work of art.

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