Bob Ross was not a painter.
In queueing theory , a discipline within the mathematical theory of probability , quasireversibility -LRB- sometimes QR -RRB- is a property of some queues .. queueing theory. queueing theory. theory of probability. probability theory. The concept was first identified by Richard R. Muntz and further developed by Frank Kelly .. Richard R. Muntz. Richard R. Muntz. Frank Kelly. Frank Kelly ( professor ). Quasireversibility differs from reversibility in that a stronger condition is imposed on arrival rates and a weaker condition is applied on probability fluxes .. For example , an M / M / 1 queue with state-dependent arrival rates and state-dependent service times is reversible , but not quasireversible .. A network of queues , such that each individual queue when considered in isolation is quasireversible , always has a product form stationary distribution .. product form. product form solution. Quasireversibility had been conjectured to be a necessary condition for a product form solution in a queueing network , but this was shown not to be the case .. product form. product form solution. Chao et al. exhibited a product form network where quasireversibility was not satisfied .. product form. product form solution