Tasaarvossa

Tasaarvossa is an Estonian mathematical term used to describe the state or property of belonging to the even parity class, i.e., being an even number, in a linguistic form that marks location or state. The word combines tasaarv (parity or evenness) with the inessive suffix -ossa, roughly translating to “in even parity.” In mathematical usage, a number described as tasaarvossa satisfies n ≡ 0 (mod 2).

In practical terms, tasaarvossa is a way to express that an element lies in the even equivalence class modulo 2. The natural opposite state is described with terms such as paaritu (odd) or by stating that a number is not tasaarvossa. When referring to sets, one can speak of the tasaarvossa arvud or the tasaarvossa klass, meaning the set of even numbers or the even parity class, typically written as {n ∈ Z | n ≡ 0 (mod 2)}.

Examples of tasaarvossa numbers include 0, 2, 4, and 14. Numbers such as 1, 3, and 5 are not tasaarvossa. The term is most commonly encountered in educational and theoretical contexts; in everyday mathematics, they may simply be described as even numbers (paaris numbrid).

See also: tasaarv, paaris number, odd numbers. Note that while tasaarvossa appears in some Estonian texts, more common terminology for the concept is the phrase “paaris number” for even numbers and “paaritu” for odd numbers.