Concepts inSmall hop-diameter sparse spanners for doubling metrics
Wrench
A spanner or wrench is a tool used to provide grip and mechanical advantage in applying torque to turn objects¿usually rotary fasteners, such as nuts and bolts¿or keep them from turning. In British English, spanner is the standard term. The most common shapes are called open-ended spanner and ring spanner. The term wrench refers to a type of adjustable spanner. In American English, wrench is the standard term. The very most common shapes are called open-end wrench and box-end wrench.
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Ackermann function
In computability theory, the Ackermann function, named after Wilhelm Ackermann, is one of the simplest and earliest-discovered examples of a total computable function that is not primitive recursive. All primitive recursive functions are total and computable, but the Ackermann function illustrates that not all total computable functions are primitive recursive.
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E
Not to be confused with ¿ or ¿. For, E# redirects here. For the musical note, see E¿ (musical note). For the mathematical constant, see e (mathematical constant). For other uses, see E (disambiguation). E ISO basic Latin alphabet Aa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Ss Tt Uu Vv Ww Xx Yy Zz E is a vowel and the fifth letter in the ISO basic Latin alphabet.
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Metric space
In mathematics, a metric space is a set where a notion of distance between elements of the set is defined. The metric space which most closely corresponds to our intuitive understanding of space is the 3-dimensional Euclidean space. In fact, the notion of "metric" is a generalization of the Euclidean metric arising from the four long-known properties of the Euclidean distance.
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Asterisk
An asterisk is a typographical symbol or glyph. It is so called because it resembles a conventional image of a star. Computer scientists and mathematicians often pronounce it as star (as, for example, in the A* search algorithm or C*-algebra). In English, an asterisk is usually five-pointed in sans-serif typefaces, six-pointed in serif typefaces, and six- or eight-pointed when handwritten. It can be used to censor vulgar words or objectionable text.
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M
M is the thirteenth letter of the ISO basic Latin alphabet. It is used to represent one thousand in Roman numerals.
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Inverse function
In mathematics, an inverse function is a function that undoes another function: If an input x into the function ¿ produces an output y, then putting y into the inverse function g produces the output x, and vice versa. i.e. , ¿(x)=y, and g(y)=x. More directly, g(¿)=x, meaning g(x) composed with ¿(x) leaves x unchanged.
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Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle. The word "diameter" derives from Greek ¿¿¿¿¿¿¿¿¿ (diametros), "diagonal of a circle", from ¿¿¿- (dia-), "across, through" + ¿¿¿¿¿¿ (metron), "a measure"). In more modern usage, the length of a diameter is also called the diameter.
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