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  2. Saxon math - Wikipedia

    en.wikipedia.org/wiki/Saxon_math

    The Saxon Math 1 to Algebra 1/2 (the equivalent of a Pre-Algebra book) curriculum [3] is designed so that students complete assorted mental math problems, learn a new mathematical concept, practice problems relating to that lesson, and solve a variety of problems. Daily practice problems include relevant questions from the current day's lesson ...

  3. Length contraction - Wikipedia

    en.wikipedia.org/wiki/Length_contraction

    For mathematical consistency, Lorentz proposed a new time variable, the "local time", called that because it depended on the position of a moving body, following the relation t ′ = t − vx/c 2. [8] Lorentz considered local time not to be "real"; rather, it represented an ad hoc change of variable. [9]: 51, 80

  4. Economic Calculation in the Socialist Commonwealth

    en.wikipedia.org/wiki/Economic_Calculation_in...

    Marxist computer programmer Paul Cockshott argues that economic calculation is possible within a socialist state as long as computational devices are used. In "Towards a New Socialism's "Information and Economics: A Critique of Hayek" and "Against Mises", he argues that central planning is simplified by the use of computers in calculating the component of price not accounted for by Marxian ...

  5. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

  6. Mathematics of three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_three-phase...

    An important property of three-phase power is that the instantaneous power available to a resistive load, = =, is constant at all times.Indeed, let = = To simplify the mathematics, we define a nondimensionalized power for intermediate calculations, =

  7. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Mental calculation consists of arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator. People may use mental calculation when computing tools are not available, when it is faster than other means of calculation (such as conventional educational institution ...

  8. Singapore math - Wikipedia

    en.wikipedia.org/wiki/Singapore_math

    A bar model used to solve an addition problem. This pictorial approach is typically used as a problem-solving tool in Singapore math. Singapore math teaches students mathematical concepts in a three-step learning process: concrete, pictorial, and abstract. [3] This learning process was based on the work of an American psychologist, Jerome Bruner.

  9. Economic calculation problem - Wikipedia

    en.wikipedia.org/wiki/Economic_calculation_problem

    The economic calculation problem (ECP) is a criticism of using central economic planning as a substitute for market-based allocation of the factors of production. It was first proposed by Ludwig von Mises in his 1920 article " Economic Calculation in the Socialist Commonwealth " and later expanded upon by Friedrich Hayek .

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