käänteislukuja
Käänteislukuja, in mathematics, refers to the multiplicative inverse of a number. For any non-zero number x, its multiplicative inverse, denoted as 1/x or x⁻¹, is the number that, when multiplied by x, results in 1. The concept of a käänteisluku is fundamental in arithmetic and algebra, enabling operations like division and solving equations.
Every non-zero real number has a unique käänteisluku. For example, the käänteisluku of 2 is 1/2, because
The number zero does not have a käänteisluku. This is because there is no number that, when