yhteenlaskun

Yhteenlasku, and its genitive form yhteenlaskun, refers to the arithmetic operation of adding numbers to obtain a sum. In practice it covers combining two or more addends, such as 3 + 5 = 8. The term yhteenlaskun is commonly used when speaking about the process or the rules of addition, for example yhteenlaskun säännöt or yhteenlaskun tulos.

Etymology and usage: yhteenlasku is formed from yhteen (together) and lasku (calculation, counting). The phrase describes both the action of adding and the result produced by this action. In Finnish mathematical writing, yhteenlasku is the standard term for the operation, while yhteenlaskun is used in genitive constructions to express possession or relation, such as the rules of addition or the outcome of an addition.

Mathematical properties and scope: Addition is a binary operation that combines numbers to produce a sum. It is commutative (a + b = b + a) and associative (a + (b + c) = (a + b) + c). The identity element for addition is 0, and the set of numbers under addition is closed. In decimal arithmetic, carries may occur when adding multi-digit numbers. Addition extends beyond integers to rational numbers, real numbers, and other numeric systems, maintaining these basic properties.

Applications: yhteenlasku is fundamental in mathematics education and everyday calculations. It is used in accounting and budgeting to compute totals, in data processing to sum values, and in programming as the addition operation represented by the plus symbol. The concept underpins more advanced topics such as summation, averages, and statistical totals.

See also: arithmetic, addition, summation.