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Compactification (mathematics) In mathematics, in general topology, compactification is the process or result of making a topological space into a compact space. [1] A compact space is a space in which every open cover of the space contains a finite subcover. The methods of compactification are various, but each is a way of controlling points ...
An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing ...
Interstellar travel is the hypothetical travel of spacecraft from one star system, solitary star, or planetary system to another. Interstellar travel is expected to prove much more difficult than interplanetary spaceflight due to the vast difference in the scale of the involved distances. Whereas the distance between any two planets in the ...
Apple AirPods (2nd Generation) $80 $129 Save $49. This is an outrageous price for AirPods! In fact, it's a record-low price, so if you've been toying with a pair or need to replace your current ...
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Contraction mapping. In mathematics, a contraction mapping, or contraction or contractor, on a metric space ( M , d) is a function f from M to itself, with the property that there is some real number such that for all x and y in M , The smallest such value of k is called the Lipschitz constant of f. Contractive maps are sometimes called ...
A SpaceX rocket has failed for the first time in nearly a decade, leaving the company’s internet satellites in an orbit so low that they're doomed to fall through the atmosphere and burn up. The ...
Record summer air travel demand isn’t translating to record U.S. airline profits. Carriers will have to answer for that disconnect when they report quarterly results this month. Some airlines ...