pythagorean identities
41Mathematical fallacy — In mathematics, certain kinds of mistakes in proof, calculation, or derivation are often exhibited, and sometimes collected, as illustrations of the concept of mathematical fallacy. The specimens of the greatest interest can be seen as… …
42Mollweide's formula — Figure 1 – A triangle. The angles α, β, and γ are respectively opposite the sides a, b, and c …
43Feminist philosophy (french) — French feminist philosophy De Beauvoir, Kristeva, Irigaray, Le Doeuff, Cixous Alison Ainley INTRODUCTION Although women have been active philosophers for many centuries,1 the development of a specifically feminist viewpoint in the context of… …
44Slide rule — For other uses, see Slide rule (disambiguation). A typical ten inch student slide rule (Pickett N902 T simplex trig). The slide rule, also known colloquially as a slipstick,[1] is a mechanical analog computer. The slide rule is used primarily for …
45Euclidean vector — This article is about the vectors mainly used in physics and engineering to represent directed quantities. For mathematical vectors in general, see Vector (mathematics and physics). For other uses, see vector. Illustration of a vector …
46Tautochrone curve — 300px|right|thumb|Four points run over a cycloid from different positions, but theyarrive at the bottom at the same time. The blue arrows show the points acceleration. On the top is the time position diagram.A tautochrone or isochrone curve is… …
47Tiwanaku — Tiwanaku: Spiritual and Political Centre of the Tiwanaku Culture * UNESCO World Heritage Site …
48Quadratic form — In mathematics, a quadratic form is a homogeneous polynomial of degree two in a number of variables. For example, is a quadratic form in the variables x and y. Quadratic forms occupy a central place in various branches of mathematics, including… …
49Bragg's law — In physics, Bragg s law is the result of experiments into the diffraction of X rays or neutrons off crystal surfaces at certain angles, derived by physicist Sir William Lawrence Bragg [ There are some sources, like the Academic American… …
50Descartes' theorem — For other uses, see Descartes theorem (disambiguation). In geometry, Descartes theorem, named after René Descartes, establishes a relationship between four kissing, or mutually tangent, circles. The theorem can be used to construct a fourth… …
