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 Free Download Da hat der Himmel die Erde berührt: Was wir an Weihnachten feiern By Hermann-Josef Frisch 2012 | 128 Pages | ISBN: 3843602344 | EPUB | 1 MB Weihnachten steht in der öffentlichen Wahrnehmung vor allem für Tannenbäume, Schneeflocken, Kerzenschein und Geschenke. Und die Sehnsucht nach Ruhe und Frieden, wenn das Gedränge in den Einkaufspassagen vorbei ist. Diese Sehnsucht jedoch bliebe ungestillt, wäre Weihnachten lediglich ein Fest des gemütlichen Ausruhens. Wo lässt sich heute ein tieferer Sinn des Festes finden? Anders gefragt: Was feiern wir eigentlich an Weihnachten? Hermann-Josef Frisch gelingt es, Herkunft und Botschaft des beliebtesten christlichen Festes zu erläutern und ins Heute zu übersetzen. Von den biblischen und historischen Grundlagen bis zu den bekannten Bräuchen informiert er kundig über Entwicklung und Bedeutung des Weihnachtsfestes. Ein bemerkenswertes Buch, kompakt, informativ und inspirierend.  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More than 70 entities are described in individual chapters that follow a uniform structure: historical review, clinical features, histopathology, histogenesis, immunohistochemistry, molecular anomalies, and treatment. Readers will find state of the art knowledge on all aspects, including the cytogenetic and chromosomal abnormalities associated with each neoplasm.  Free Download Curves and Surfaces by Marco Abate , Francesca Tovena English | EPUB (True) | 2012 | 407 Pages | ISBN : 8847019400 | 4.5 MB The book provides an introduction to Differential Geometry of Curves and Surfaces. The theory of curves starts with a discussion of possible definitions of the concept of curve, proving in particular the classification of 1-dimensional manifolds. We then present the classical local theory of parametrized plane and space curves (curves in n-dimensional space are discussed in the complementary material): curvature, torsion, Frenet's formulas and the fundamental theorem of the local theory of curves. Then, after a self-contained presentation of degree theory for continuous self-maps of the circumference, we study the global theory of plane curves, introducing winding and rotation numbers, and proving the Jordan curve theorem for curves of class C2, and Hopf theorem on the rotation number of closed simple curves. The local theory of surfaces begins with a comparison of the concept of parametrized (i.e., immersed) surface with the concept of regular (i.e., embedded) surface. We then develop the basic differential geometry of surfaces in R3: definitions, examples, differentiable maps and functions, tangent vectors (presented both as vectors tangent to curves in the surface and as derivations on germs of differentiable functions; we shall consistently use both approaches in the whole book) and orientation. Next we study the several notions of curvature on a surface, stressing both the geometrical meaning of the objects introduced and the algebraic/analytical methods needed to study them via the Gauss map, up to the proof of Gauss' Teorema Egregium. Then we introduce vector fields on a surface (flow, first integrals, integral curves) and geodesics (definition, basic properties, geodesic curvature, and, in the complementary material, a full proof of minimizing properties of geodesics and of the Hopf-Rinow theorem for surfaces). 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