Mathematics – Probability
Scientific paper
2001-03-12
Extracta Mathematicae, 17 n.2 (2002), 201-209
Mathematics
Probability
9 pages
Scientific paper
We study a general transition operator, generated by a random walk on a graph $X$; in particular we give necessary and sufficient condition on the matrix coefficient (1-step transition probablilities) to be a bounded operator from $l^\infty(X)$ into itself. Moreover we characterize compact operators and we relate this property to the behaviour of the associated random walk. We give a necessary and sufficient condition for the pre-adjoint of the discrete Laplace operator to be an injective map.
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