The von Neumann inequality for 3×3 matrices in the unit Euclidean ball
Abstract
It is shown that the constant cd,3 in von Neumann's inequality for d-tuples of commutative and row contractive 3×3 matrices, as proved by Hartz, Richter, and Shalit in [2], is independent of the size of the d-tuple. A numerical estimation of the constant is provided.
0
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.