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Billy Rose
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Wehnelt cylinder
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Commutative monoid
In abstract algebra, a monoid is a set equipped with an associative binary operation and an identity element. For example, the nonnegative integers with addition form a monoid, the identity element
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Hearing problems
Hearing loss is a partial or total inability to hear. Hearing loss may be present at birth or acquired at any time afterwards. Hearing loss may occur in one or both ears. In children, hearing probl
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Wilhelm Westphal
Wilhelm Heinrich Westphal (3 March 1882, in Hamburg – 5 June 1978, in Berlin) was a German physicist. From 1918, he was a professor at the University of Berlin. During the period 1922 to 1924, he w
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Hadamard matrix
In mathematics, an Hadamard matrix, named after the French mathematician Jacques Hadamard, is a square matrix whose entries are either +1 or −1 and whose rows are mutually orthogonal. In geometric
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Walter Grotrian
Walter Robert Wilhelm Grotrian (21 April 1890 in Aachen; † 3 March 1954 in Potsdam) was a German astronomer and astrophysicist.German physicists and chemists in 1920. Standing, left to right: Walte
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Electron emission
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Jacques Hadamard
Jacques Salomon Hadamard ForMemRS (French: [adamaʁ] ; 8 December 1865 – 17 October 1963) was a French mathematician who made major contributions in number theory, complex analysis, differential geo
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Member accessibility
In object-oriented programming, a class defines the shared aspects of objects created from the class. The capabilities of a class differ between programming languages, but generally the shared aspe
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