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• Sitter, Willem de — ▪ Dutch mathematician and astronomer born May 6, 1872, Sneek, Neth. died Nov. 20, 1934, Leiden       Dutch mathematician, astronomer, and cosmologist who developed theoretical models of the universe based on Albert Einstein s general theory of… …   Universalium

• de Sitter invariant special relativity — In mathematical physics, de Sitter invariant special relativity is the speculative idea that the fundamental symmetry group of spacetime is the Indefinite orthogonal group SO(4,1), that of de Sitter space. In the standard theory of General… …   Wikipedia

• de Sitter space — In mathematics and physics, a de Sitter space is the analog in Minkowski space, or spacetime, of a sphere in ordinary, Euclidean space. The n dimensional de Sitter space , denoted dSn, is the Lorentzian manifold analog of an n sphere (with its… …   Wikipedia

• Trip sitter — is a term used by recreational or spiritual drug users to describe a person who remains sober to ensure the safety of the drug user while he or she is under the influence of a drug; they are especially common with first time experiences or when… …   Wikipedia

• Carl L. Sitter — Infobox Military Person name= Carl Leonard Sitter born= birth date|1922|12|2 died= death date and age|2000|4|4|1922|12|2 placeofbirth= Syracuse, Missouri placeofdeath= Richmond, Virginia married= Velma Ruth Tichenor Sitter, 1926 placeofburial=… …   Wikipedia

• Ulbo de Sitter — Infobox Scientist box width = name = Lamoraal Ulbo de Sitter image size = caption = birth date = March 6 1902 birth place = Groningen death date = May 12 1980 death place = Nistelrode residence = Leiden University citizenship = Dutch nationality …   Wikipedia

• Window sitter — A window sitter, sometimes known as a desktop sitter, is a graphical application that displays a character sitting on top of other application windows running on a computer. The character is often a cute animal, or a super deformed anime… …   Wikipedia

• cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …   Universalium

• painting, Western — ▪ art Introduction       history of Western painting from its beginnings in prehistoric times to the present.       Painting, the execution of forms and shapes on a surface by means of pigment (but see also drawing for discussion of depictions in …   Universalium

• Mona Lisa — This article is about the painting. For other uses, see Mona Lisa (disambiguation). Mona Lisa Italian: La Gioconda, French: La Joconde …   Wikipedia