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  2. System of linear equations - Wikipedia

    en.wikipedia.org/wiki/System_of_linear_equations

    The number of vectors in a basis for the span is now expressed as the rank of the matrix. Solution set The solution set for the equations x − y = −1 and 3x + y = 9 is the single point (2, 3). A solution of a linear system is an assignment of values to the variables x 1, x 2, ..., x n such that each of the equations is satisfied.

  3. Greatest common divisor - Wikipedia

    en.wikipedia.org/wiki/Greatest_common_divisor

    In mathematics, the greatest common divisor(GCD) of two or more integers, which are not all zero, is the largest positive integer that divideseach of the integers. For two integers x, y, the greatest common divisor of xand yis denoted gcd(x,y){\displaystyle \gcd(x,y)}. For example, the GCD of 8 and 12 is 4, that is, gcd(8, 12) = 4.

  4. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    The product of two numbers or the multiplication between two numbers can be defined for common special cases: natural numbers, integers, rational numbers, real numbers, complex numbers, and quaternions. Product of two natural numbers 3 by 4 is 12. The product of two natural numbers , is defined as:

  5. Horner's method - Wikipedia

    en.wikipedia.org/wiki/Horner's_method

    0.5 │ 46 0 3 −5 │ 22 −1 1 └─────────────────────── 22 −1 1 −4 The third row is the sum of the first two rows, divided by 2. Each entry in the second row is the product of 1 with the third-row entry to the left.

  6. Sum and Product Puzzle - Wikipedia

    en.wikipedia.org/wiki/Sum_and_Product_Puzzle

    So P now knows the numbers are 4 and 13 and tells S that he knows the numbers. From this, S now knows that of the possible pairs based on the sum (viz. 2+15, 3+14, 4+13, 5+12, 6+11, 7+10, 8+9) only one has a product that would allow P to deduce the answer, that being 4 + 13.

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  8. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For any integer n, n ≡ 1 (mod 2) if and only if 3n + 1 ≡ 4 (mod 6). Equivalently, ⁠ n − 1 / 3 ⁠ ≡ 1 (mod 2) if and only if n ≡ 4 (mod 6). Conjecturally, this inverse relation forms a tree except for the 1–24 loop (the inverse of the 42–1 loop of the unaltered function f defined in the Statement of the problem section of ...

  9. Algebraic number - Wikipedia

    en.wikipedia.org/wiki/Algebraic_number

    This polynomial is irreducible over the rationals and so the three cosines are conjugate algebraic numbers. Likewise, tan 3 π / 16, tan 7 π / 16, tan 11 π / 16, and tan 15 π / 16 satisfy the irreducible polynomial x 4 − 4x 3 − 6x 2 + 4x + 1 = 0, and so are conjugate algebraic integers. This is the equivalent of angles which, when ...