Dvoretzky's theorem

== English == === Etymology === Proved by Aryeh Dvoretzky in the early 1960s. === Proper noun === Dvoretzky's theorem (mathematics) An important structural theorem in the theory of Banach spaces, essentially stating that every sufficiently high-dimensional normed vector space will have low-dimensional subspaces that are approximately Euclidean. === Further reading === Dvoretzky's theorem on Wikipedia.Wikipedia