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Yeah, but he couldn't, and didn't. There's no reason to believe that a von Neumann level supercomputer can marshal the resources necessary to create a clone, let alone an infinite number of clones.
Yes, he was a flesh and blood human that died before the invention of reliable human cloning. (and cloning doesn't produce an identical copy of the genius adult, it produces a delayed-birth identical twin that needs to be raised in order to be smart).
Apart from the fact that "cloning" an instance of software is as simple as just starting the same program again (on a different machine in this case)? If your stupidest co-worker can do it, it seems like a fair bet that von Neuman could, too.
It can easily clone the software, but not a machine that can run it.
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Von Neumann was not a supercomputer, he was a meat human with a normalish ≈20W power consumption brain, ie 1/40th of a modern GPU. This is proof that if you can emulate an idiot, there exists an algorithm of a very similar computation intensity that gets you a Von Neumann.
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