The purpose of this page is to host any and all errata for any work posted on this site.
21-268 Recitation Notes – Errata:
Exercise 2.4: Property P needs to be stable under intersections.
Section 4.3: I claimed that κ : C^1([0,1]) -> R via κ(f) = f'(0) is a discontinuous linear map. Of course, this is false if you give C^1 the natural normed structure
||f||_C^1 = ||f||_∞ + ||f'||_∞.
However, it is indeed discontinuous if you just view C^1 as a subspace of C([0,1]) with the uniform norm, and this is what I meant.
Model theory pocket guide – Errata:
"M models T" means T is a subset of Th(M), not equal to Th(M).