Fixní

Fixní is a Czech adjective meaning fixed, constant, or stationary. It describes something that does not change under specified conditions. The word derives from Latin fixus, via French fixe; in Czech the form is fixní. In Slovak, a cognate form is fixný.

In mathematical and scientific contexts fixní is used to denote elements or values that remain unchanged under certain operations or within a model. A common example is fixní bod, or fixed point, which is a point x such that a function f satisfies f(x) = x. In economics and business, fixní náklady refer to costs that do not depend on the level of production, such as rent or salaries. In finance, fixní sazba describes an interest rate or fee that remains constant for a defined term. In everyday Czech, the term also appears in contract language and engineering to indicate parameters retained constant, such as fixní hodnoty or fixní parametry used in models or specifications.

Fixní is typically contrasted with terms meaning variable or changeable, such as proměnlivý or variabilní. It is most common in technical, scientific, and formal contexts, and less typical in casual everyday speech where pevný or konstantní might be preferred for physical objects or general steadiness.