noun
multivalued function; multiple-valued function
A mathematical function that can return more than one value for a given input, such as the complex logarithm or inverse trigonometric functions.
複素解析では、平方根や対数関数は多価関数として扱われる。
In complex analysis, the square root and logarithmic functions are treated as multivalued functions.
多価関数の主値を定義することで、一価関数として扱うことができる。
By defining the principal value of a multivalued function, it can be treated as a single-valued function.