Invariants in symbolic modeling and verification of requirements

The paper presents the usage of invariants technique for symbolic modeling and verification of requirements for reactive systems. It includes checking of the safety, completeness, liveness, and consistency properties, deadlocks and livelocks detection. The paper describes the iterative method of double approximation and the method of undetermined coefficients for invariants generation. Benefits, disadvantages and comparison of this technique with existing methods are considered. The paper is illustrated by examples of invariants technique usage for symbolic verification.