Reaalarvu

Reaalarvu is the genitive singular form of reaalarv, the Estonian noun meaning real number. In mathematical and linguistic usage, reaalarvu indicates a real number in a possessive or relational sense, appearing in phrases such as reaalarvu väärtus (the value of a real number) and reaalarvu ruut (the square of a real number).

The form is created by adding the genitive suffix -u to the base reaalarv. This genitive singular signals relationship, possession, or specification within a noun phrase, rather than naming a separate object. It is commonly found in compound phrases that describe mathematical operations or properties involving a real number, for example reaalarvu omadused (the properties of a real number) or reaalarvu ja selle omadused (the real number and its properties).

Context and usage notes: In Estonian, the genitive case is routinely used to connect quantities with their attributes in technical language. Reaalarvu functions as the dependent element in phrases that describe operations, measurements, or relationships tied to a real number. While not itself a distinct mathematical object, reaalarvu is an essential grammatical form in mathematical prose and textbooks.

See also: reaalarv (real number), Estonian grammar, genitive case.