m.a. wrote: > *Okay, so is it true to say that things written in EXTENSION are never > in formula style but are translated into formulas when we put them > into INTENSION form? You can see that my difficulty with math > arises from an inability to master even the simplest definitions. > marty a.*
It's not that technical. I could define the set of books on my shelf by giving a list of titles: "The Comprehensible Cosmos", "Set Theory and It's Philosophy", "Overshoot", "Quintessence". That would be a definition by extension. Or I could point to them in succession and say, "That and that and that and that." which would be a definition by ostension. Or I could just say, "The books on my shelf." which is a definition by intension. An intensional definition is a descriptive phrase with an implicit variable, which in logic you might write as: The set of things x such that x is a book and x is on my shelf. Brent --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Everything List" group. To post to this group, send email to everything-list@googlegroups.com To unsubscribe from this group, send email to everything-list+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/everything-list?hl=en -~----------~----~----~----~------~----~------~--~---
