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The minus–plus sign, ∓, is generally used in conjunction with the ± sign, in such expressions as x ± y ∓ z, which can be interpreted as meaning x + y − z or x − y + z (but not x + y + z or x − y − z). The ∓ always has the opposite sign to ±.
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Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, ...
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The New York City Transit Authority (also known as NYCTA, the TA, [2] or simply Transit, [3] and branded as MTA New York City Transit) is a public-benefit corporation in the U.S. state of New York that operates public transportation in New York City.
The Metropolitan Transportation Authority (MTA) is a public benefit corporation responsible for public transportation in the New York City metropolitan area in the northeastern United States.
Einstein's Blackboard at the Museum of the History of Science in Oxford. Einstein's Blackboard is a blackboard [1] which physicist Albert Einstein (1879–1955) used on 16 May 1931 during his lectures while visiting the University of Oxford in England. [2] [3] [4] The blackboard is in the collection of the Museum of the History of Science in ...
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