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{{short description|The midpoints of the sides of an arbitrary quadrilateral form a parallelogram}} {{for|the theorem about the moment of a force|Varignon's theorem (mechanics)}} ...

...Cite journal |last=Marle |first=Charles-Michel |date=2016 |title=The works of William Rowan Hamilton in geometrical optics and the Malus-Dupin theorem |j ...some other homogenous medium. The theorem states that the resulting pencil of light rays is still perpendicular to some other surface. ...

...ngement]] of <math>n</math> lines, with no parallel lines and no crossings of more than two lines, has at least <math>n-2</math> triangular faces. Thus, ...bounded faces with exactly three sides count as triangles for the purposes of the theorem.{{r|grunbaum}} ...

...>{{cite book | last1 = Markoutsakis | first1 = M. | year = 2021| title = Geometry, Symmetries, and Classical Physics: A Mosaic|series=|publisher= CRC Press | ...2021 | title = The generalized Friedmann model as a self-similar solution of Vlasov–Poisson equation system| url = | journal = European Physical Journal ...

...radox.svg|thumb|right|350px|"Can a ball be decomposed into a finite number of point sets and reassembled into two balls identical to the original?"]] ...ot "solids" in the traditional sense, but infinite scatterings of [[Point (geometry)|points]]. The reconstruction can work with as few as five pieces.<ref>{{C ...

...math|△''ABC''}} share a base {{mvar|AB}} and have the same area. The locus of their variable apex {{mvar|C}} is a small circle (dashed green) passing thr ...of the two points [[antipodal point|antipodal]] to the two base [[vertex (geometry)|vertices]]. ...

...ian manifold]]s. This account is intended as an introduction to the theory of [[connection (mathematics)|connections]]. ...ivative]]s and [[connection form]]s gave a more conceptual and uniform way of understanding curvature, allowing generalisations to higher-dimensional man ...

{{Short description|Methods of safely sharing general data}} ...ial_privacy_informal_definition.png|thumb|440x440px|An informal definition of differential privacy]] ...

{{Short description|Sums of sets of vectors are nearly convex}} ...sets—two points in two non-convex sets plus two points in the convex hulls of two sets. The convex hulls are shaded pink. The original sets each have ex ...