About: Quotient of subspace theorem

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In mathematics, the quotient of subspace theorem is an important property of finite-dimensional normed spaces, discovered by Vitali Milman. Let (X, ||·||) be an N-dimensional normed space. There exist subspaces Z ⊂ Y ⊂ X such that the following holds: * The quotient space E = Y / Z is of dimension dim E ≥ c N, where c > 0 is a universal constant. * The induced norm || · || on E, defined by is uniformly isomorphic to Euclidean. That is, there exists a positive quadratic form ("Euclidean structure") Q on E, such that for with K > 1 a universal constant.

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  • In mathematics, the quotient of subspace theorem is an important property of finite-dimensional normed spaces, discovered by Vitali Milman. Let (X, ||·||) be an N-dimensional normed space. There exist subspaces Z ⊂ Y ⊂ X such that the following holds: * The quotient space E = Y / Z is of dimension dim E ≥ c N, where c > 0 is a universal constant. * The induced norm || · || on E, defined by is uniformly isomorphic to Euclidean. That is, there exists a positive quadratic form ("Euclidean structure") Q on E, such that for with K > 1 a universal constant. The statement is relative easy to prove by induction on the dimension of Z (even for Y=Z, X=0, c=1) with a K that depends only on N; the point of the theorem is that K is independent of N. In fact, the constant c can be made arbitrarily close to 1, at the expense of theconstant K becoming large. The original proof allowed (en)
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  • In mathematics, the quotient of subspace theorem is an important property of finite-dimensional normed spaces, discovered by Vitali Milman. Let (X, ||·||) be an N-dimensional normed space. There exist subspaces Z ⊂ Y ⊂ X such that the following holds: * The quotient space E = Y / Z is of dimension dim E ≥ c N, where c > 0 is a universal constant. * The induced norm || · || on E, defined by is uniformly isomorphic to Euclidean. That is, there exists a positive quadratic form ("Euclidean structure") Q on E, such that for with K > 1 a universal constant. (en)
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  • Quotient of subspace theorem (en)
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