By Douglas R. Anderson, Hans J. Munkholm

A number of contemporary investigations have concentrated awareness on areas and manifolds that are non-compact yet the place the issues studied have a few type of "control close to infinity". This monograph introduces the class of areas which are "boundedly managed" over the (usually non-compact) metric house Z. It units out to boost the algebraic and geometric instruments had to formulate and to end up boundedly managed analogues of the various typical result of algebraic topology and straightforward homotopy conception. one of many topics of the booklet is to teach that during many instances the evidence of a typical end result should be simply tailored to end up the boundedly managed analogue and to supply the main points, usually passed over in different remedies, of this edition. for that reason, the booklet doesn't require of the reader an intensive historical past. within the final bankruptcy it truly is proven that specified instances of the boundedly managed Whitehead workforce are strongly with regards to decrease K-theoretic teams, and the boundedly managed concept is in comparison to Siebenmann's right easy homotopy idea while Z = IR or IR2.

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**Example text**

23) gives px = eEt and determines the periodic dependence of the electron velocity on time [15]: vx = v0 (t) ≡ aε0 cos(ωB t). 26) The frequency ωB = eEa/ is called Bloch frequency. At reasonable values of the electric ﬁeld, the frequency of the Bloch oscillations of the electron in a metal is many orders of magnitude lower than the collision frequency of the electron even in extremely pure metals (in other words, the oscillation period is much greater than the relaxation time τ in the metal, and the amplitude of the Bloch oscillations is much greater than the electron mean free path).

I. Kaganov [1], where the importance of topology of the Fermi surface for the conductivity was established. Namely, the difference between the “simple” Fermi surface (topological “sphere”) (Fig. 1a) and more complicated surfaces where the nonclosed quasiclassical electron trajectories can arise was shown. In particular, detailed consideration of the “simple” Fermi surface and surfaces like “warped cylinder” (Fig. 1b) for the diﬀerent directions of B was made. Ya. P. Novikov B B (a) (b) Fig. 1. The “simple” Fermi surface having the form of a sphere in the Brillouin zone and the periodic “warped cylinder” extending through an inﬁnite number of Brillouin zones.

The Brillouin zone in this case plays the role of the space of parameters and R=k. 43) |s = usk (x) exp(ikx), where usk (x) is the periodic in the x-space function and k is the wave vector. Bloch wave (43) and the energy εs (k) are the eigenfunction and the eigenvalue of Eq. 39) at the moment t. The quasiwave vector k is included in this equation as a parameter. For example, in the magnetic ﬁeld k(t) = k − (e/ c)A(t). 44) supposing that the quasiwave vector in the exponent exp(ikx) is independent of time.