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2. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

3. Killer sudoku - Wikipedia

   en.wikipedia.org/wiki/Killer_Sudoku

   Killer sudoku. Killer sudoku (also killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) is a puzzle that combines elements of sudoku and kakuro. Despite the name, the simpler killer sudokus can be easier to solve than regular sudokus, depending on the solver's skill at mental arithmetic; the hardest ones, however, can take hours ...

4. Magic triangle (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Magic_triangle_(mathematics)

   [5] (sequence A356808 in the OEIS) Its one modification uses triangular numbers instead of square numbers. (sequence A355119 in the OEIS) Another magic tringle form is magic triangles with triangluar numbers with different summation. In this magic triangles, the sum of the k-th row and the (n-k)-th row is same for all k.

5. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   Order of operations. In mathematicsand computer programming, the order of operationsis a collection of rules that reflect conventions about which operations to perform first in order to evaluate a given mathematical expression. These rules are formalized with a ranking of the operations. The rank of an operation is called its precedence, and an ...

6. List of rules of inference - Wikipedia

   en.wikipedia.org/wiki/List_of_rules_of_inference

   Rules of inference are syntactical transform rules which one can use to infer a conclusion from a premise to create an argument. A set of rules can be used to infer any valid conclusion if it is complete, while never inferring an invalid conclusion, if it is sound. A sound and complete set of rules need not include every rule in the following ...

7. Zeller's congruence - Wikipedia

   en.wikipedia.org/wiki/Zeller's_congruence

   Zeller's congruence. Zeller's congruence is an algorithm devised by Christian Zeller in the 19th century to calculate the day of the week for any Julian or Gregorian calendar date. It can be considered to be based on the conversion between Julian day and the calendar date.

8. Romberg's method - Wikipedia

   en.wikipedia.org/wiki/Romberg's_method

   Romberg's method. In numerical analysis, Romberg's method[ 1] is used to estimate the definite integral by applying Richardson extrapolation [ 2] repeatedly on the trapezium rule or the rectangle rule (midpoint rule). The estimates generate a triangular array. Romberg's method is a Newton–Cotes formula – it evaluates the integrand at ...

9. Three-fifths Compromise - Wikipedia

   en.wikipedia.org/wiki/Three-Fifths_Compromise

   In the U.S. Constitution, the Three-fifths Compromise is part of Article 1, Section 2, Clause 3: . Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers, which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and ...