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A city is a human settlement of a substantial size. The term "city" has different meanings around the world and in some places the settlement can be very small. Even where the term is limited to la

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In mathematics, scalar multiplication is one of the basic operations defining a vector space in linear algebra (or more generally, a module in abstract algebra). In common geometrical contexts, sca

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In macroeconomics, an industry is a branch of an economy that produces a closely related set of raw materials, goods, or services. For example, one might refer to the wood industry or to the insura

In microeconomics, the law of demand is a fundamental principle which states that there is an inverse relationship between price and quantity demanded. In other words, "conditional on all else bein

Parmenides of Elea (/p ɑːr ˈ m ɛ n ɪ d iː z ... ˈ ɛ l i ə / ; Ancient Greek: Παρμενίδης ὁ Ἐλεάτης ; fl. late sixth or early fifth century BC) was a pre-Socratic Greek philosopher from Elea in Magna

Biogeography is the study of the distribution of species and ecosystems in geographic space and through geological time. Organisms and biological communities often vary in a regular fashion along g