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Penrose triangle. The Penrose triangle, also known as the Penrose tribar, the impossible tribar, [ 1] or the impossible triangle, [ 2] is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing. It cannot exist as a solid object in ordinary three-dimensional Euclidean space ...
In theoretical physics, a Penrose diagram (named after mathematical physicist Roger Penrose) is a two-dimensional diagram capturing the causal relations between different points in spacetime through a conformal treatment of infinity. It is an extension (suitable for the curved spacetimes of e.g. general relativity) of the Minkowski diagram of ...
Penrose tiling. A Penrose tiling is an example of an aperiodic tiling. Here, a tiling is a covering of the plane by non-overlapping polygons or other shapes, and a tiling is aperiodic if it does not contain arbitrarily large periodic regions or patches. However, despite their lack of translational symmetry, Penrose tilings may have both ...
Roger Penrose. Sir Roger Penrose, OM, FRS, HonFInstP (born 8 August 1931) [ 1] is a British mathematician, mathematical physicist, philosopher of science and Nobel Laureate in Physics. [ 2] He is Emeritus Rouse Ball Professor of Mathematics in the University of Oxford, an emeritus fellow of Wadham College, Oxford, and an honorary fellow of St ...
This is a list by date of birth of historically recognized American fine artists known for the creation of artworks that are primarily visual in nature, including traditional media such as painting, sculpture, photography, and printmaking, as well as more recent genres, including installation art, performance art, body art, conceptual art, digital art and video art.
Pierre-Joseph Redouté. Pierre-Joseph Redouté ( French pronunciation: [pjɛʁ ʒozɛf ʁədute], 10 July 1759 – 19 June 1840), was a painter and botanist from the Austrian Netherlands, known for his watercolours of roses, lilies and other flowers at the Château de Malmaison, many of which were published as large coloured stipple engravings ...
Compass (drawing tool) A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, it can also be used as a tool to mark out distances, in particular, on maps. Compasses can be used for mathematics, drafting, navigation and other purposes.
Six Penrose drains were left and the edges of the surgical wound were closed with staples. A Penrose drain is a soft, flexible rubber tube used as a surgical drain, to prevent the buildup of fluid in a surgical site. It belongs to the "passive" type of drain, the other broad type being "active". The Penrose drain is named after American ...
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