By M. Abate,F. Tovena
ISBN-10: 8847019400
ISBN-13: 9788847019409
The neighborhood conception of surfaces starts with a comparability of the idea that of parametrized (i.e., immersed) floor with the idea that of normal (i.e., embedded) floor. We then advance the fundamental differential geometry of surfaces in R3: definitions, examples, differentiable maps and capabilities, tangent vectors (presented either as vectors tangent to curves within the floor and as derivations on germs of differentiable capabilities; we will continuously use either techniques within the complete booklet) and orientation. subsequent we research the various notions of curvature on a floor, stressing either the geometrical that means of the gadgets brought and the algebraic/analytical equipment had to learn them through the Gauss map, as much as the facts of Gauss’ Teorema Egregium.
Then we introduce vector fields on a floor (flow, first integrals, fundamental curves) and geodesics (definition, easy houses, geodesic curvature, and, within the complementary fabric, an entire evidence of minimizing homes of geodesics and of the Hopf-Rinow theorem for surfaces). Then we will current an explanation of the prestigious Gauss-Bonnet theorem, either in its neighborhood and in its worldwide shape, utilizing simple houses (fully proved within the complementary fabric) of triangulations of surfaces. As an program, we will turn out the Poincaré-Hopf theorem on zeroes of vector fields. ultimately, the final bankruptcy can be dedicated to numerous vital effects at the worldwide concept of surfaces, like for example the characterization of surfaces with consistent Gaussian curvature, and the orientability of compact surfaces in R3.
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Curves and Surfaces (UNITEXT) by M. Abate,F. Tovena
by Brian
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