# A Treatise on the Differential Geometry of Curves and by Luther Pfahler Eisenhart

March 9, 2017 | | By admin |

By Luther Pfahler Eisenhart

Created specially for graduate scholars, this introductory treatise on differential geometry has been a hugely winning textbook for a few years. Its strangely precise and urban procedure features a thorough clarification of the geometry of curves and surfaces, targeting difficulties that might be so much beneficial to scholars. 1909 edition.

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Extra resources for A Treatise on the Differential Geometry of Curves and Surfaces (Dover Phoenix Editions)

Sample text

Shall derive the property of this sphere which radius is -f- , We accounts for its name. M When the tangent to a curve at a point is tangent likewise to a sphere at this point, the center of the sphere lies in the normal R denotes its radius and the curve is plane to the curve at M. If referred to the trihedral at M, the coordinates of the center C of the 2 Let P(x, y, z) sphere are of the form (0, y v z t ) and yl + z* = ^ be a point of the curve near M, and Q the point in which the line CP cuts the sphere.

At each point passes through the center of the sphere. If this equation be differen tiated, we get 77 = p hence the center of the sphere is on the polar line for each point. Another differentiation gives, together with the preceding, the following ; coordinates of the center of the sphere When the last of these equations is - (92) Conversely, when : differentiated -f (rp Y = we obtain the desired condition 0. this condition is satisfied, the point with the coordinates (91) is lies and at constant distance from points of the curve.

The angle between the radius of the osculating sphere for any curve and the locus of the center of the sphere is equal to the angle between the radius of the osculating circle and the locus of the center of curvature. 3. curve 4. y = The locus is Find the radii of a cos 2 it, z construction. 5. of the center of curvature of a curve is an evolute only when the plane. and second curvature of the curve x = a sin u cos w, is spherical, and give a geometrical first = asinw. Show that the curve Find its evolutes.