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The Principles and Standards for School Mathematics was developed by the NCTM. The NCTM's stated intent was to improve mathematics education. The contents were based on surveys of existing curriculum materials, curricula and policies from many countries, educational research publications, and government agencies such as the U.S. National Science Foundation. [3]
The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.
Hasse diagram of the natural numbers, partially ordered by "x≤y if x divides y".The numbers 4 and 6 are incomparable, since neither divides the other. In mathematics, two elements x and y of a set P are said to be comparable with respect to a binary relation ≤ if at least one of x ≤ y or y ≤ x is true.
A number that is not part of any friendly pair is called solitary. The abundancy index of n is the rational number σ(n) / n, in which σ denotes the sum of divisors function. A number n is a friendly number if there exists m ≠ n such that σ(m) / m = σ(n) / n. Abundancy is not the same as abundance, which is defined as σ(n) − 2n.
The packing number of K, denoted (), is the maximum cardinality of any packing of K. A subset S of K is r - separated if each pair of points x and y in S satisfies d ( x , y ) ≥ r . The metric entropy of K , denoted N r met ( K ) {\displaystyle N_{r}^{\text{met}}(K)} , is the maximum cardinality of any r -separated subset of K .
The Book of Numbers is a 1996 mathematics book by John H. Conway and Richard K. Guy. It discusses individual numbers, and types of number, that have proved conceptually significant. It discusses individual numbers, and types of number, that have proved conceptually significant.