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bounded away from zero

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  • Calculus of variations — is a field of mathematics that deals with extremizing functionals, as opposed to ordinary calculus which deals with functions. A functional is usually a mapping from a set of functions to the real numbers. Functionals are often formed as definite …   Wikipedia

  • Noisy-channel coding theorem — In information theory, the noisy channel coding theorem (sometimes Shannon s theorem), establishes that for any given degree of noise contamination of a communication channel, it is possible to communicate discrete data (digital information)… …   Wikipedia

  • Continuous spectrum — The spectrum of a linear operator is commonly divided into three parts: point spectrum, continuous spectrum, and residual spectrum. If H is a topological vector space and is a linear map, the spectrum of A is the set of complex numbers λ such… …   Wikipedia

  • Rider (Fate/Zero) — Rider is a fictional character from the Japanese novel Fate/Zero by TYPE MOON and fellow developer Nitroplus.He is a servant of Waver Velvet in the 4th Holy Grail War. Rider is noble and physically overbearing, who prefers to conquer his enemies… …   Wikipedia

  • Cheeger constant (graph theory) — In mathematics, the Cheeger constant (also Cheeger number or isoperimetric number) of a graph is a numerical measure of whether or not a graph has a bottleneck . The Cheeger constant as a measure of bottleneckedness is of great interest in many… …   Wikipedia

  • Hadwiger–Nelson problem — Unsolved problems in mathematics How many colors are needed to color the plane so that no two points at unit distance are the same color? In geometric graph theory, the Hadwiger–Nelson problem, named after Hugo Hadwiger and Edward Nelson, asks… …   Wikipedia

  • Semi-elliptic operator — In mathematics mdash; specifically, in the theory of partial differential equations mdash; a semi elliptic operator is a partial differential operator satisfying a positivity condition slightly weaker than that of being an elliptic operator.… …   Wikipedia

  • Floating point — In computing, floating point describes a method of representing real numbers in a way that can support a wide range of values. Numbers are, in general, represented approximately to a fixed number of significant digits and scaled using an exponent …   Wikipedia

  • Modular form — In mathematics, a modular form is a (complex) analytic function on the upper half plane satisfying a certain kind of functional equation and growth condition. The theory of modular forms therefore belongs to complex analysis but the main… …   Wikipedia

  • Quantum computer — A quantum computer is a device for computation that makes direct use of distinctively quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. In a classical (or conventional) computer, information is… …   Wikipedia

  • N-body problem — otheruses4|the problem in classical mechanics|the problem in quantum mechanics|Many body problem The n body problem is the problem of finding, given the initial positions, masses, and velocities of n bodies, their subsequent motions as determined …   Wikipedia

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