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2. Verbal arithmetic - Wikipedia

   en.wikipedia.org/wiki/Verbal_arithmetic

   Verbal arithmetic, also known as alphametics, cryptarithmetic, cryptarithm or word addition, is a type of mathematical game consisting of a mathematical equation among unknown numbers, whose digits are represented by letters of the alphabet.

3. Digital sum - Wikipedia

   en.wikipedia.org/wiki/Digital_sum

   The digit sum - add the digits of the representation of a number in a given base. For example, considering 84001 in base 10 the digit sum would be 8 + 4 + 0 + 0 + 1 = 13. The digital root - repeatedly apply the digit sum operation to the representation of a number in a given base until the outcome is a single digit. For example, considering ...

4. 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 ...

5. Natural number - Wikipedia

   en.wikipedia.org/wiki/Natural_number

   The addition (+) and multiplication (×) operations on natural numbers as defined above have several algebraic properties: Closure under addition and multiplication: for all natural numbers a and b, both a + b and a × b are natural numbers. [52] Associativity: for all natural numbers a, b, and c, a + (b + c) = (a + b) + c and a × (b × c ...

6. Generating set of a group - Wikipedia

   en.wikipedia.org/wiki/Generating_set_of_a_group

   The 5th roots of unity in the complex plane form a group under multiplication. Each non-identity element generates the group. In abstract algebra, a generating set of a group is a subset of the group set such that every element of the group can be expressed as a combination (under the group operation) of finitely many elements of the subset and their inverses.