FAQ on π-Calculus

Let P and Q denote processes. Then • P | Q denotes a process composed of P and Q running in parallel. • a(x).P denotes a process that waits to read a value x from the channel a and then, having received it, behaves like P. • ā〈x〉.P denotes a process that first waits to send the value x along the channel a and then, after x has been accepted by some input process, behaves like P. • (νa)P ensures that a is a fresh channel in P. (Read the Greek letter “nu” as “new.”) • !P denotes an infinite number of copies of P, all running in parallel. • P + Q denotes a process that behaves like either P or Q. • 0 denotes the inert process that does nothing.