31. With multiple state variables and multiple control variables, the Riccati equation will be a matrix equation. 32. A compressibility factor of one also requires the four state variables to follow the ideal gas law. 33. It is also possible to cause state shifts in another context, by indirectly affecting state variables . 34. Used sparingly, extended state variables and guards make up a powerful mechanism that can simplify designs. 35. A system itself is said to be unstable if at least one of its state variables is unstable. 36. They are uniquely determined by the thermodynamic state as it has been identified by the original state variables . 37. The thermodynamic entropy ( at equilibrium ) is a function of the state variables of the model description. 38. Sensible heat causes a change of the temperature of the system while leaving the chosen state variable unchanged. 39. The value of the state variable crisply defines the current state of the system at any given time. 40. The context class has a state variable that it instantiates in an initial state, in this case StateLowerCase.
