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2. Summation - Wikipedia

   en.wikipedia.org/wiki/Summation

   t. e. In mathematics, summation is the addition of a sequence of numbers, called addends or summands; the result is their sum or total. Beside numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any type of mathematical objects on which an operation denoted "+" is defined.

3. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   Addition (usually signified by the plus symbol +) is one of the four basic operations of arithmetic, the other three being subtraction, multiplication and division. [2] The addition of two whole numbers results in the total amount or sum of those values combined. The example in the adjacent image shows two columns of three apples and two apples ...

4. Zero-sum game - Wikipedia

   en.wikipedia.org/wiki/Zero-sum_game

   Zero-sum game is a mathematical representation in game theory and economic theory of a situation that involves two competing entities, where the result is an advantage for one side and an equivalent loss for the other. [ 1] In other words, player one's gain is equivalent to player two's loss, with the result that the net improvement in benefit ...

5. Abundant number - Wikipedia

   en.wikipedia.org/wiki/Abundant_number

   An abundant number is a natural number n for which the sum of divisors σ(n) satisfies σ(n) > 2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n) satisfies s(n) > n. The abundance of a natural number is the integer σ(n) − 2n (equivalently, s(n) − n).

6. Perfect number - Wikipedia

   en.wikipedia.org/wiki/Perfect_number

   By definition, a perfect number is a fixed point of the restricted divisor function s(n) = σ(n) − n, and the aliquot sequence associated with a perfect number is a constant sequence. All perfect numbers are also -perfect numbers, or Granville numbers . A semiperfect number is a natural number that is equal to the sum of all or some of its ...

7. Measure (mathematics) - Wikipedia

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

   Measure (mathematics) Informally, a measure has the property of being monotone in the sense that if is a subset of the measure of is less than or equal to the measure of Furthermore, the measure of the empty set is required to be 0. A simple example is a volume (how big an object occupies a space) as a measure.

8. Empty sum - Wikipedia

   en.wikipedia.org/wiki/Empty_sum

   Empty sum. In mathematics, an empty sum, or nullary sum, [1] is a summation where the number of terms is zero. The natural way to extend non-empty sums [2] is to let the empty sum be the additive identity . Let , , , ... be a sequence of numbers, and let. be the sum of the first m terms of the sequence. This satisfies the recurrence.

9. Algebraic expression - Wikipedia

   en.wikipedia.org/wiki/Algebraic_expression

   In mathematics, an algebraic expression is an expression built up from constants (usually, rational or algebraic numbers) variables, and the basic algebraic operations: addition (+), subtraction (-), multiplication (×), division (÷), whole number powers, and roots (fractional powers).