6103 | Normally a class with only one member is a problem, because the class and the member are identical [Russell] |
13203 | The singleton is defined using the pairing axiom (as {x,x}) [Enderton] |
10813 | What on earth is the relationship between a singleton and an element? [Lewis] |
10814 | Are all singletons exact intrinsic duplicates? [Lewis] |
15497 | We can replace the membership relation with the member-singleton relation (plus mereology) [Lewis] |
15505 | If a set is 'a many thought of as one', beginners should protest against singleton sets [Lewis] |
15506 | If we don't understand the singleton, then we don't understand classes [Lewis] |
15511 | If singleton membership is external, why is an object a member of one rather than another? [Lewis] |
15513 | Maybe singletons have a structure, of a thing and a lasso? [Lewis] |
9551 | What is special about Bill Clinton's unit set, in comparison with all the others? [Chihara] |
8956 | What is a singleton set, if a set is meant to be a collection of objects? [Szabó] |
14243 | The unit set may be needed to express intersections that leave a single member [Oliver/Smiley] |