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Is the Dark Matter Real?
The notion of a group, you'r a with that, i am. But maybe the folks in the audience aren't so o. It's a mathematical object of a certain sort a, a very broad class of mathematical objects that obey certain properties. And it's not clear we can get the one we're really thinking of, which is what i've just said: zero, one, two, three and no more. I actually don't think there's a real distinction here. We but we have a different picture.