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Aiming Low Is Harder -- Induction for Lower Bounds in Probabilistic Program Verification

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arxiv 1904.01117 v3 pith:LMQCJ6T6 submitted 2019-04-01 cs.LO cs.PL

Aiming Low Is Harder -- Induction for Lower Bounds in Probabilistic Program Verification

classification cs.LO cs.PL
keywords boundslowerexpectedprobabilisticruleaimingappliedbody
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a new inductive rule for verifying lower bounds on expected values of random variables after execution of probabilistic loops as well as on their expected runtimes. Our rule is simple in the sense that loop body semantics need to be applied only finitely often in order to verify that the candidates are indeed lower bounds. In particular, it is not necessary to find the limit of a sequence as in many previous rules.

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