Algebraic topology: a first course - download pdf or read online

By Marvin J. Greenberg

ISBN-10: 0805335579

ISBN-13: 9780805335576

ISBN-10: 0805335587

ISBN-13: 9780805335583

Great first publication on algebraic topology. Introduces (co)homology via singular theory.

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10b, c illustrate the intensity and phase respectively of such a Gaussian random sum of the complex spherical harmonics with l = 15, pictured on the surface of the sphere. The result is visually similar to our previous depictions of random waves, but a statistical analysis of such superpositions would reveal that its statistics are modified by the nature of the sphere; in particular, (a) -1 (b) normalised intensity 1 (c) intensity 0 phase 2π Fig. 10 Random waves via spherical harmonics. a shows the real part of each spherical harmonic of index l = 7 labelled with each of m = 0 → 7; a complex, Gaussian random sum would be over all m with random phase coefficients.

The difference to the previous two manifolds is that vortices occupy a region of effective finite volume, not directly confined but only rarely entering the region where the potential exceeds the eigenfunction energy, a very different type of constraint to the finite volume of the 3-torus or 3-sphere. We will see later how this affects the behaviour of the vortex tangle. The eigenfunctions of the QHO are equivalent to the RWM in the limit of the energy becoming infinite, in which case the value of the potential is negligible across an arbitrarily large volume, and the wave superposition becomes locally indistinguishable from the isotropic random wave model.

A) and (b) show the intensity and phase in an example with 100 interfering waves, and (c) and (d) the same with 10000. Although these values for N are very different, there are no statistical differences between the images that are obvious by visual inspection; given only the images, it would be difficult if not impossible to tell by eye which is closer to the infinite wave limit. The motivation for a random wave model is that it makes accessible a wide range of statistical properties that cannot be obtained by direct calculation on a specific system.

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Algebraic topology: a first course by Marvin J. Greenberg

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