Practice problem
Let ℘\wp℘ be a prime ideal of a ring AAA. When is A/℘→A℘/℘A℘A/\wp \to A_\wp/\wp A_\wpA/℘→A℘/℘A℘ an isomorphism?
Always
When ℘\wp℘ is maximal
Never
Type a concept, like “slope” or “photosynthesis”.