“…The type "set" (set) corresponds to the classical clearly distinguished collection of elements, the type "semi-set" (sm) corresponds to a fuzzy collection and the type "class" (cls) corresponds to a set of objects, the type and partition of which cannot be uniquely determined at a given level of abstraction. An example of a computational problem that requires the Set@l fuzzy collections for its description is the Jacobi SLAE algorithm [31]. Unlike other approaches to parallel programming of high-performance computer systems, the Set@l programming language specifies not only boundary cases of the algorithm implementation, but also a family of intermediate options.…”