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  1. No Access

    Chapter

    H

    Algebras with one ternary operation that satisfies certain identities.

    V. N. Saliĭ, F. P. Vasil’ev, S. V. Matveev, A. N. Parshin… in Encyclopaedia of Mathematics (1995)

  2. No Access

    Chapter

    P

    A group which has a normal series such that the order of every factor contains at most one prime from π (π is a set of prime numbers). The class of π-separable groups contains the class of π-solvable groups (cf.

    S. P. Strunkov, A. N. Parshin, V. G. Sprindzhuk… in Encyclopaedia of Mathematics (1995)

  3. No Access

    Chapter

    H

    A Hausdorff space which, under any topological imbedding into an arbitrary Hausdorff space Y, is a closed set in Y. The characteristic property of an H-closed space is that any open covering of the space contains...

    V. I. Ponomarev, Yu. B. Rudyak, A. F. Kharshiladze… in Encyclopaedia of Mathematics (1995)

  4. No Access

    Chapter

    E

    ϵ-ENTROPY of a set in a metric space - The logarithm to the base 2 of the smallest number of points in an ϵ-net for this set. In other words, the ϵ-entropy ℋϵ(C, X) of a set C lying in a metric space (X, ρ)

    V. M. Tikhomirov, S. A. Stepanov, A. B. Ivanov… in Encyclopaedia of Mathematics (1995)