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Ideas & learning · Developing

Mouche No. 2-class schooner-avisos

The Mouche No. 2-class schooner-avisos were a class of twenty-eight 1-gun dispatch or advice boats of the French Navy, all built between 1808 and 1810. Jean Baudry designed the vessels based on the draught of Villaret. B

Reading time
7 min
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Ideas & learning · Advanced

Road signs in Belgium

in Belgium Road signs in Belgium are defined in the Royal Decree of 1 December 1975 on general regulations for the road traffic police and in the use of public highways. They generally conform to the 1968 Vienna Conventi

Reading time
15 min
Complete text
26223 characters
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88%
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Ideas & learning · Advanced

Holographic optical element

A holographic optical element (HOE) is an optical component (mirror, lens, directional diffuser, etc.) that produces holographic images using principles of diffraction. HOE is most commonly used in transparent displays,

Reading time
6 min
Complete text
10032 characters
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85%
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Ideas & learning · Advanced

Symbols of the European Union

The European Union (EU) uses a number of symbols, including the Flag of Europe, Anthem of Europe, Motto of the European Union and Europe Day. These symbols have no official status based in the EU treaties, but they are i

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6 min
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10069 characters
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83%
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Ideas & learning · Challenging

Smith–Minkowski–Siegel mass formula

In mathematics, the Smith–Minkowski–Siegel mass formula (or Minkowski–Siegel mass formula) is a formula for the sum of the weights of the lattices (quadratic forms) in a genus, weighted by the reciprocals of the orders o

Reading time
6 min
Complete text
10123 characters
Dictionary coverage
83%
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