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Johnson and Thomas, 1975 (RFC 677)
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Fischer and Michael, 1982
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(Alpern and Schneider, 1985)
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Liveness properties are inherently
problematic. The question of whether a real
system satisfies a liveness property is
meaningless; it can be answered only by
observing the system for an infinite length of
time, and real systems don’t run forever.
Liveness is always an approximation to the
property we really care about. We want a
program to terminate within 100 years, but
proving that it does would require the
addition of distracting timing assumptions.
So, we prove the weaker condition that the
program eventually terminates. This doesn’t
prove that the program will terminate within
our lifetimes, but it does demonstrate the
absence of infinite loops.
(Lamport, 2000; emphasis added)
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