31. In particular, the class of objects may often be defined or characterized by systems of equations . 32. In general it is computationally intractable to solve this system of equations for most queueing models. 33. There are many software packages that are capable of solving the rotor dynamic system of equations . 34. He also continued his academic work, developing the Physical Energetics Systems of Equations ( PESE ). 35. This results in a coupled system of equations which can be integrated to obtain the trajectory. 36. This system of equations is a slightly modified version of the system needed for signature creation. 37. After some manipulations, the system of equations reads, 38. To generate test data so as to traverse a path involves solving a system of equations . 39. There are many software packages that are capable of solving the torsional vibration system of equations . 40. The first part of the problem can be solved readily by setting up a system of equations .