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  2. Four fours - Wikipedia

    Four fours is a mathematical puzzle. The goal of four fours is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four (no other digit is allowed). Most versions of four fours require that each expression have exactly four fours, but some variations ...

  3. California Basic Educational Skills Test - Wikipedia

    v. t. e. The California Basic Educational Skills Test ( CBEST) is a standardized test administered in the state of California. It is available as an option in Oregon and Nevada. The test is intended to score basic proficiency in reading, mathematics, and writing. The test is divided into three sections: the reading and math sections each ...

  4. Intersection (set theory) - Wikipedia

    The intersection is the set of elements that exists in both set. A {\displaystyle A} and set. B {\displaystyle B} . Symbolic statement. A ∩ B = { x : x ∈ A and x ∈ B } {\displaystyle A\cap B=\ {x:x\in A {\text { and }}x\in B\}} In mathematics, the intersection of two sets and denoted by [1] is the set containing all elements of that also ...

  5. Digital root - Wikipedia

    The digital root (also repeated digital sum) of a natural number in a given radix is the (single digit) value obtained by an iterative process of summing digits, on each iteration using the result from the previous iteration to compute a digit sum. The process continues until a single-digit number is reached.

  6. Lagrange polynomial - Wikipedia

    In numerical analysis, the Lagrange interpolating polynomial is the unique polynomial of lowest degree that interpolates a given set of data. Given a data set of coordinate pairs with the are called nodes and the are called values. The Lagrange polynomial has degree and assumes each value at the corresponding node,

  7. Talk:Sums of four cubes problem - Wikipedia

    This article contains a translation of Problème des quatre cubes from fr.wikipedia

  8. Proportionality (mathematics) - Wikipedia

    k = y x . {\displaystyle k= {\frac {y} {x}}.} It is also called the constant of variation or constant of proportionality . A direct proportionality can also be viewed as a linear equation in two variables with a y -intercept of 0 and a slope of k. This corresponds to linear growth .

  9. Localization (commutative algebra) - Wikipedia

    Localization (commutative algebra) In commutative algebra and algebraic geometry, localization is a formal way to introduce the "denominators" to a given ring or module. That is, it introduces a new ring/module out of an existing ring/module R, so that it consists of fractions such that the denominator s belongs to a given subset S of R.

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