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You have this world of mathematics, which is very real and which contains all kinds of wonderful stuff. And then we also have the world of nature, which is real, too.

"Legendary physicist Freeman Dyson talks about math, nuclear rockets, and astounding things about the universe". Interview with Elena Holodny, www.businessinsider.com. September 9, 2016.
You have this world of mathematics, which is very real and which contains all kinds of wonderful stuff. And then we also have the world of nature, which is real, too.