# convenient

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**Central vacuum cleaner**— The power unit of a typical central vacuum cleaner for residential use A central vacuum cleaner (also known as built in or ducted) is a type of vacuum cleaner appliance, installed into a building as a semi permanent fixture. Central vacuum… …122

**handy**— I (New American Roget s College Thesaurus) adj. convenient, near, available, ready; adept, dexterous, apt; competent, capable, expert. See skill, utility. II (Roget s IV) modif. 1. [Near] Syn. nearby, at hand, close by; see convenient 2 , near 1 …123

**inconvenient**— adjective Etymology: Middle English, incongruous, harmful, from Anglo French, from Latin inconvenient , inconveniens, from in + convenient , conveniens convenient Date: 1651 not convenient especially in giving trouble or annoyance ; inopportune < …124

**Chemistry**— For other uses, see Chemistry (disambiguation). Chemistry is the science of atomic matter (that made of chemical elements), its properties, structure, comp …125

**Duodecimal**— For the similar sounding classification system, see Dewey Decimal Classification. Numeral systems by culture Hindu Arabic numerals Western Arabic (Hindu numerals) Eastern Arabic Indian family Tamil Burmese Khmer Lao Mongolian Thai East Asian… …126

**Discrete Fourier transform**— Fourier transforms Continuous Fourier transform Fourier series Discrete Fourier transform Discrete time Fourier transform Related transforms In mathematics, the discrete Fourier transform (DFT) is a specific kind of discrete transform, used in… …127

**Feynman diagram**— The Wick s expansion of the integrand gives (among others) the following termNarpsi(x)gamma^mupsi(x)arpsi(x )gamma^ upsi(x )underline{A mu(x)A u(x )};,whereunderline{A mu(x)A u(x )}=int{d^4pover(2pi)^4}{ig {mu u}over k^2+i0}e^{ k(x x )}is the… …128

**Power law**— A power law is any polynomial relationship that exhibits the property of scale invariance. The most common power laws relate two variables and have the form:f(x) = ax^k! +o(x^k),where a and k are constants, and o(x^k) is of x. Here, k is… …