Lower Bounds for Possibly Divergent Probabilistic Programs

02/13/2023
by   Shenghua Feng, et al.
0

We present a new proof rule for verifying lower bounds on quantities of probabilistic programs. Our proof rule is not confined to almost-surely terminating programs – as is the case for existing rules – and can be used to establish non-trivial lower bounds on, e.g., termination probabilities and expected values, for possibly divergent probabilistic loops, e.g., the well-known three-dimensional random walk on a lattice.

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