käänteisjäsen
Käänteisjäsen is a Finnish term that translates to "inverse member" or "reverse member." It is a concept primarily used in the context of mathematics, specifically within set theory and abstract algebra. A käänteisjäsen refers to an element that, when combined with another element through a binary operation, results in the identity element of that operation. For a binary operation '*' and elements 'a' and 'e' in a set S, where 'e' is the identity element, if a * b = e and b * a = e, then 'b' is the käänteisjäsen of 'a', and vice versa.
This concept is closely related to the idea of an inverse element in group theory. In a