KnowraHahn–Banach theoremLinked fromLinked fromThe 13 pages that link to Hahn–Banach theorem, each with the reason it gives.All 13Broader topic 2Related 8Compared with 3Riesz representation theoremCompared with: It applies broadly to normed spaces, while Riesz representation requires Hilbert-space structure.Riesz–Markov–Kakutani representation theoremCompared with: Hahn–Banach guarantees extensions, while this theorem identifies functionals through measures.Lions–Lax–Milgram theoremCompared with: It is a foundational functional-analysis result, but does not itself give variational solvability.