koeffisidentekoeffisientteja
Koeffisidentekoeffisientteja is a neologism used in some Finnish mathematical discussions to refer to coefficients of coefficients in nested or multi-level coefficient structures. The term combines koeffisientti (coefficient) with tek—implying a coefficient that itself carries coefficients—and the plural suffix -teja. It is primarily a descriptive label for second-order coefficient data rather than a distinct formal theory.
Formally, suppose a family of coefficients c_i resides in a vector space V with a chosen basis
In practice, these second-order coefficients arise when the coefficients themselves come from a basis expansion. For
Applications include hierarchical or multi-stage modeling, polynomial chaos expansions, and symbolic computations where nested coefficients are