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This article reviews the topic of Bayesian networks. A Bayesian network is a factorisation of a probability distribution along a directed acyclic graph. The relation between graphical d-separation and independence is described. A short article from 1853 by Arthur Cayley  is discussed, which contains several ideas later used in Bayesian networks: factorisation, the noisy 'or' gate, applications of algebraic geometry to Bayesian networks. The ideas behind Pearl's intervention calculus when thedoi:10.14708/ma.v40i1.278 fatcat:xftrlk4azvg3viilrzuikg5o7q