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by skissane
2042 days ago
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No, the point was that 𝑈∈𝑋 is a typo and 𝑈⊆𝑋 is what was intended. Type theory will reject the mistake but set theory will accept it. This is then presented as a reason why mathematicians should prefer type-theory-based proof assistants to set-theory-based ones, since the former will catch these kinds of mistakes while the later won't. |
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