Alvis language with time dependence

The paper presents the semantics for the time version of the Alvis modelling language. Alvis combines possibilities of formal models verification with flexibility and simplicity of practical programming languages. The considered time Alvis language is suitable for formal verification of real-time systems. The paper contains description of: the Alvis time model, states and transitions between states and snapshot reachability graphs that represent models state spaces in the form of directed graphs.