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The following questions are often encountered in system and control theory. Given an algebraic model of a physical process, which variables can be, in theory, deduced from the input-output behavior of an experiment? How many of the remaining variables should we assume to be known in order to determine all the others? These questions are parts of the local algebraic observability problem which is concerned with the existence of a non trivial Lie subalgebra of model's symmetries letting thedoi:10.1145/384101.384143 dblp:conf/issac/Sedoglavic01 fatcat:y7x5ediutrcl5a6biksty5wwim