- #71
Hurkyl
Staff Emeritus
Science Advisor
Gold Member
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I'm stating that Tarski's system is not as limited as you make it out to be. There are clear limitations -- e.g. that the theory of integer arithmetic cannot be expressed in it -- but it is not as limited as you claim -- e.g. it is able to discuss lines.yossell said:Hurkyl, I'm not following you. I'm not interested in convenience. I've already said there are limitations in what can be done in Tarksi's system. Your posts seemed to be arguing the contrary, but now it seems they are not.
The objection you had against lines was that you were rejecting the syntactic tools of first-order logic. Constructing the type of Euclidean Lines from the type of Euclidean Points, for example, is pure first-order logic -- you are not creating a new theory by doing so.