Proof in predicate logic 4: Universal Generalization

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How can it ever be legitimate to infer from "this particular thing is green" to "everything in the universe is green"? Here's how!
  1. Simon Cushing
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I really appreciate this explanation, I didn't know that the rule for UG is that you can only use it on variables introduced using UI or assumptions, I didnt understand the way my professor explained it. Thanks!

anty.
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being able to write backwards is an admirable skill

zhouscar