"So the idea of the multiverse, as you all know, is a pretty big idea in physics right now. Many physicists are thinking about interpreting quantum theory in terms of the multiverse or many-worlds interpretation. Max Tegmark, for example, has the idea that there's what he calls a Level IV multiverse. He thinks that mathematics is fundamental. So the fundamental reality is just mathematics, and in some sense, Gödel's incompleteness theorem says that there's endless mathematics. There's no end to mathematical exploration. And so that's Tegmark's multiverse: whatever is mathematically possible is actual."

Donald D. Hoffman is a Professor of Cognitive Sciences at the University of California, Irvine. He is the author of The case against reality: Why evolution hid the truth from our eyes. His research on perception, evolution, and consciousness received the Troland Award of the US National Academy of Sciences, the Distinguished Scientific Award for Early Career Contribution of the American Psychological Association, the Rustum Roy Award of the Chopra Foundation, and is the subject of his TED Talk, titled “Do we see reality as it is?”

http://www.cogsci.uci.edu/~ddhoff/

The Case Against Reality

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