4 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
11966 | If there are essential properties, how do you find out what they are? [Chisholm] |
11965 | Could possible Adam gradually transform into Noah, and vice versa? [Chisholm] |
22200 | If you eliminate the impossible, the truth will remain, even if it is weird [Conan Doyle] |