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  2. Riemannian manifold - Wikipedia

    en.wikipedia.org/wiki/Riemannian_manifold

    For example, the class of two-dimensional Euclidean space forms includes Riemannian metrics on the Klein bottle, the Möbius strip, the torus, the cylinder S 1 × ℝ, along with the Euclidean plane. Unlike the case of two-dimensional spherical space forms, in some cases two space form structures on the same manifold are not homothetic.

  3. Induction puzzles - Wikipedia

    en.wikipedia.org/wiki/Induction_puzzles

    Induction puzzles are logic puzzles, which are examples of multi-agent reasoning, where the solution evolves along with the principle of induction. [1] [2]A puzzle's scenario always involves multiple players with the same reasoning capability, who go through the same reasoning steps.

  4. Algebraic curve - Wikipedia

    en.wikipedia.org/wiki/Algebraic_curve

    An algebraic curve in the Euclidean plane is the set of the points whose coordinates are the solutions of a bivariate polynomial equation p(x, y) = 0.This equation is often called the implicit equation of the curve, in contrast to the curves that are the graph of a function defining explicitly y as a function of x.

  5. Möbius transformation - Wikipedia

    en.wikipedia.org/wiki/Möbius_transformation

    These transformations preserve angles, map every straight line to a line or circle, and map every circle to a line or circle. The Möbius transformations are the projective transformations of the complex projective line. They form a group called the Möbius group, which is the projective linear group PGL(2, C).

  6. Length contraction - Wikipedia

    en.wikipedia.org/wiki/Length_contraction

    In the rest frame of the center of a wheel, wheels are circular and their spokes are straight and equidistant, but their circumference is contracted and exerts a pressure on the spokes. Length contraction is the phenomenon that a moving object's length is measured to be shorter than its proper length , which is the length as measured in the ...

  7. Newton's theorem of revolving orbits - Wikipedia

    en.wikipedia.org/wiki/Newton's_theorem_of...

    Figure 6: For the blue particle moving in a straight line, the radius r from a given center varies with angle according to the equation b = r cos(θ − θ 0), where b is the distance of closest approach (impact parameter, shown in red). The simplest illustration of Newton's theorem occurs when there is no initial force, i.e., F 1 (r) = 0. In ...

  8. BMW N63 - Wikipedia

    en.wikipedia.org/wiki/BMW_N63

    In 2012, a "Technical Update" was applied to the N63, resulting in the N63TU variants (also known as N63B44O1).The main upgrade was the addition of Valvetronic. [11] [12] Other changes include revised turbochargers, removal of the blowoff valve, lighter pistons, forged connecting rods and crankshaft, addition of a valve cover labyrinth oil catch/return system, new valve stem seals, revised ...

  9. Ford Focus (second generation, Europe) - Wikipedia

    en.wikipedia.org/wiki/Ford_Focus_(second...

    The Ford Focus Mk 2 is the second generation of Ford Focus, a range of small family cars produced by Ford Motor Company from 2005 to 2010. It was launched at the Paris Motor Show on September 25, 2004, as a three and five-door hatchback and an estate, although the new car was previewed, in 4-door saloon form, as the 'Focus Concept' developed by Ford Europe at the Beijing Motor Show in mid-2005.