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Comparison of English dictionaries. This is a comparison of English dictionaries, which are dictionaries about the language of English. The dictionaries listed here are categorized into "full-size" dictionaries (which extensively cover the language, and are targeted to native speakers), "collegiate" (which are smaller, and often contain other ...
Houghton Mifflin Harcourt ( / ˈhoʊtən /; [ 9] HOH-tən; HMH) is an American publisher of textbooks, instructional technology materials, assessments, and reference works. The company is based in the Boston Financial District. It was formerly known as Houghton Mifflin Company, but it changed its name following the 2007 acquisition of Harcourt ...
projection. A projection is, roughly, a map from some space or object to another that omits some information on the object or space. For example, R 2 → R , ( x , y ) ↦ x {\displaystyle \mathbb {R} ^ {2}\to \mathbb {R} , (x,y)\mapsto x} is a projection and its restriction to a graph of a function, say, is also a projection.
Harcourt School Publishers – U.S. elementary (pre-K–6) publisher with particular strength in the four major subject areas of science, reading, math and social studies. Holt, Rinehart and Winston – U.S. secondary (grades 6–12) publisher with a leading position in literature and language arts, the largest middle and secondary school ...
Some students studying math may develop an apprehension or fear about their performance in the subject. This is known as math anxiety or math phobia, and is considered the most prominent of the disorders impacting academic performance. Math anxiety can develop due to various factors such as parental and teacher attitudes, social stereotypes ...
The Learning Company ( TLC) was an educational software company founded in 1980 in Palo Alto, California and headquartered in Fremont, California. The company produced a grade-based line of learning software, edutainment games, and productivity tools. Its titles included the flagship series Reader Rabbit, for preschoolers through second graders ...
Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...
Harcourt's theorem. Harcourt's theorem is a formula in geometry for the area of a triangle, as a function of its side lengths and the perpendicular distances of its vertices from an arbitrary line tangent to its incircle. [1] The theorem is named after J. Harcourt, an Irish professor. [2]