New posts in Ultrapowers

Stationary correctness of ultrapowers by low order measures

Is it ever a good idea to use Keisler-Shelah to show elementary equivalence?

Surreal numbers, ultrapowers of $\Bbb R$, ordinal-valued functions and the slow-growing hierarchy

An Extender is a Generalization of an Ultrafilter?

Is every field extension of an ultrafield an ultrafield?