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  2. Word problem (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Word_problem_(mathematics)

    The word problem for an algebra is then to determine, given two expressions (words) involving the generators and operations, whether they represent the same element of the algebra modulo the identities. The word problems for groups and semigroups can be phrased as word problems for algebras. [1]

  3. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

  4. Three-part lesson - Wikipedia

    en.wikipedia.org/wiki/Three-part_lesson

    The role of the teacher is to "get students mentally prepared to work on the problem". [1] Marian Small, a proponent of a constructivist approach to mathematical instruction, provides an example of an inquiry-based question from which a three-part lesson could be created: "one bus has 47 students in it; another has 38. How many students are on ...

  5. Associative algebra - Wikipedia

    en.wikipedia.org/wiki/Associative_algebra

    Every polynomial ring R[x 1, ..., x n] is a commutative R-algebra. In fact, this is the free commutative R-algebra on the set {x 1, ..., x n}. The free R-algebra on a set E is an algebra of "polynomials" with coefficients in R and noncommuting indeterminates taken from the set E. The tensor algebra of an R-module is naturally an associative R ...

  6. Modular arithmetic - Wikipedia

    en.wikipedia.org/wiki/Modular_arithmetic

    Existence: There exists an integer denoted a −1 such that aa −11 (mod m) if and only if a is coprime with m. This integer a −1 is called a modular multiplicative inverse of a modulo m. If a ≡ b (mod m) and a −1 exists, then a −1 ≡ b −1 (mod m) (compatibility with multiplicative inverse, and, if a = b, uniqueness modulo m).

  7. Eureka effect - Wikipedia

    en.wikipedia.org/wiki/Eureka_effect

    In this problem a set of 8 coins is arranged on a table in a certain configuration, and the subject is told to move 2 coins so that all coins touch exactly three others. The difficulty in this problem comes from thinking of the problem in a purely 2-dimensional way, when a 3-dimensional approach is the only way to solve the problem. [33]

  8. Direct sum of modules - Wikipedia

    en.wikipedia.org/wiki/Direct_sum_of_modules

    In abstract algebra, the direct sum is a construction which combines several modules into a new, larger module. The direct sum of modules is the smallest module which contains the given modules as submodules with no "unnecessary" constraints, making it an example of a coproduct. Contrast with the direct product, which is the dual notion.

  9. Eureka (word) - Wikipedia

    en.wikipedia.org/wiki/Eureka_(word)

    Eureka comes from Ancient Greek εὕρηκα (heúrēka) 'I have found (it)', which is the first person singular perfect indicative active of the verb εὑρίσκω heurískō ' I find '. [1] It is closely related to heuristic , which refers to experience-based techniques for problem-solving, learning, and discovery.

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