With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Divergent reviewers compared it unfavorably to other adaptations.
text_B: In mathematics , the Poisson boundary is a measure space associated to a random walk .. mathematics. mathematics. measure space. Measure ( mathematics ). random walk. random walk. It is an object designed to encode the asymptotic behaviour of the random walk , i.e. how trajectories diverge when the number of steps goes to infinity .. random walk. random walk. asymptotic. Asymptotic analysis. Despite being called a boundary it is in general a purely measure-theoretical object and not a boundary in the topological sense .. boundary in the topological sense. Compactification ( mathematics ). However , in the case where the random walk is on a topological space the Poisson boundary can be related to the Martin boundary which is an analytic construction yielding a genuine topological boundary .. random walk. random walk. Martin boundary. Martin boundary. Both boundaries are related to harmonic functions on the space via generalisations of the Poisson formula .. Poisson formula. Poisson kernel
not_related.