3 ideas
17699 | Variables are auxiliary notions, and not part of the 'eternal' essence of logic [Schönfinkel] |
8249 | Class membership is not transitive, unlike being part of a part of the whole [Lesniewski, by George/Van Evra] |
12887 | A whole must have one characteristic, an internal relation, and a structure [Rescher/Oppenheim] |