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  2. Arithmetico-geometric sequence - Wikipedia

    en.wikipedia.org/wiki/Arithmetico-geometric_sequence

    The elements of an arithmetico-geometric sequence () are the products of the elements of an arithmetic progression (in blue) with initial value and common difference , = + (), with the corresponding elements of a geometric progression (in green) with initial value and common ratio , =, so that [4]

  3. How to Solve It - Wikipedia

    en.wikipedia.org/wiki/How_to_Solve_It

    First, you have to understand the problem. [2] After understanding, make a plan. [3] Carry out the plan. [4] Look back on your work. [5] How could it be better? If this technique fails, Pólya advises: [6] "If you cannot solve the proposed problem, try to solve first some related problem. Could you imagine a more accessible related problem?"

  4. Algebraic expression - Wikipedia

    en.wikipedia.org/wiki/Algebraic_expression

    An algebraic equation is an equation involving polynomials, for which algebraic expressions may be solutions. If you restrict your set of constants to be numbers, any algebraic expression can be called an arithmetic expression. However, algebraic expressions can be used on more abstract objects such as in Abstract algebra.

  5. List of NP-complete problems - Wikipedia

    en.wikipedia.org/wiki/List_of_NP-complete_problems

    The program is solvable in polynomial time if the graph has all undirected or all directed edges. Variants include the rural postman problem. [3]: ND25, ND27 Clique cover problem [2] [3]: GT17 Clique problem [2] [3]: GT19 Complete coloring, a.k.a. achromatic number [3]: GT5 Cycle rank; Degree-constrained spanning tree [3]: ND1

  6. LP-type problem - Wikipedia

    en.wikipedia.org/wiki/LP-type_problem

    By using the recursive algorithm to solve a given problem, switching to the iterative algorithm for its recursive calls, and then switching again to Seidel's algorithm for the calls made by the iterative algorithm, it is possible solve a given LP-type problem using O(dn + d! d O(1) log n) violation tests.

  7. Never forget: 23 years ago, the day that changed everything - AOL

    www.aol.com/never-forget-23-years-ago-070019237.html

    Twenty-three years since the day that changed everything. Since that impossibly blue sky on a crisp autumn morning. Since the first plane. Then the second plane. Since one building fell. Then the ...

  8. Closed-form expression - Wikipedia

    en.wikipedia.org/wiki/Closed-form_expression

    The quadratic formula =. is a closed form of the solutions to the general quadratic equation + + =. More generally, in the context of polynomial equations, a closed form of a solution is a solution in radicals; that is, a closed-form expression for which the allowed functions are only n th-roots and field operations (+,,, /).

  9. Quartic equation - Wikipedia

    en.wikipedia.org/wiki/Quartic_equation

    In general, there exist only four possible cases of quartic equations with multiple roots, which are listed below: [3] Multiplicity-4 (M4): when the general quartic equation can be expressed as a ( x − l ) 4 = 0 {\displaystyle a(x-l)^{4}=0} , for some real number l {\displaystyle l} .