3 ideas
9355 | One sort of circularity presupposes a premise, the other presupposes a rule being used [Braithwaite, by Devitt] |
18758 | Validity is provable, but invalidity isn't, because the model is infinite [Church, by McGee] |
5880 | Xenocrates held that the soul had no form or substance, but was number [Xenocrates, by Cicero] |