it is not intuitively obvious that ...

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• obvious — adj. VERBS ▪ appear, be, look, seem, sound ▪ become ▪ It soon became obvious that the machine did not work. ▪ …   Collocations dictionary

• Euclidean geometry — A Greek mathematician performing a geometric construction with a compass, from The School of Athens by Raphael. Euclidean geometry is a mathematical system attributed to the Alexandrian Greek mathematician Euclid, which he described in his… …   Wikipedia

• Vacuous truth — A vacuous truth is a truth that is devoid of content because it asserts something about all members of a class that is empty or because it says If A then B when in fact A is false. For example, the statement all cell phones in the room are turned …   Wikipedia

• Concept — For other uses, see Concept (disambiguation). A concept (substantive term: conception) is a cognitive unit of meaning an abstract idea or a mental symbol sometimes defined as a unit of knowledge, built from other units which act as a concept s… …   Wikipedia

• river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …   Universalium

• Geometric algebra — In mathematical physics, a geometric algebra is a multilinear algebra described technically as a Clifford algebra over a real vector space equipped with a non degenerate quadratic form. Informally, a geometric algebra is a Clifford algebra that… …   Wikipedia

• Comparison of vector algebra and geometric algebra — Vector algebra and geometric algebra are alternative approaches to providing additional algebraic structures on vector spaces, with geometric interpretations, particularly vector fields in multivariable calculus and applications in mathematical… …   Wikipedia

• Dead on arrival — For other uses, see Dead on arrival (disambiguation). Dead on arrival or D.O.A. (also dead in the field) is a term used to indicate that a patient was found to be already clinically dead upon the arrival of professional medical assistance, often… …   Wikipedia

• Ollie (skateboarding) — This article covers the skateboard trick. For other uses, see Ollie. A skateboarder performing an Ollie The ollie is a skateboarding trick where the rider and board leap into the air without the use of the rider s hands.[1 …   Wikipedia

• Social dominance orientation — (SDO), is a personality variable which predicts social and political attitudes. It is a widely applied Social Psychological scale. SDO is conceptualised as a measure of individual differences in levels of group based discrimination and… …   Wikipedia

• High-visibility clothing — High visibility clothing, a type of personal protective equipment (PPE), is any clothing worn that has highly reflective properties or a color that is easily discernible from any background. Orange hunting vests are a popular example of high… …   Wikipedia