![]() If you find yourself working with two versions of a variable, say a free x and a Skolem x, you are in trouble. Then they are regarded internally as Skolem variables and rendered in orange: They are rendered in green, while free variables are blue.Īnother way to make m and n universal is via for. Surely we wanted to prove this fact for all m and n. So although the little fact has been proved, it just refers to some particular m and n that we know nothing about. Neither are they declared locally in the have line (using for). That’s because they aren’t fixed in the lemma statement (either explicitly by fixes or implicitly by being mentioned). Look carefully at the penultimate line below: Other uses of colour are subtler, but still important. Some colours will be obvious to you: purple, as above, for a running proof method, and red for syntax errors. ![]()
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