Geodesic
Groups of homeomorphisms of the line. Criteria for the existence of invariant and projectively invariant measures in terms of the commutator subgroup
Sbornik. Mathematics, Tome 205 (2014) no. 12, pp. 1741-1760 Cet article a éte moissonné depuis la source Math-Net.Ru

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Existence criteria for invariant and projectively invariant measures are obtained for a group $G$ of homeomorphisms of the line. These criteria are formulated in terms of the commutator subgroup $[G,G]$. For the special (but very important) case of groups of homeomorphisms of the line containing a freely acting element we obtain a criterion for the existence of a projectively invariant measure in the form of the absence of a special subgroup with two generators in which one of the generating elements is a freely acting element. Bibliography: 20 titles.
Keywords: groups of homeomorphisms of the line (the circle), invariant measure, projectively invariant measures. 
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     title = {Groups of homeomorphisms of the line. {Criteria} for the existence of invariant and projectively invariant measures in terms of the commutator subgroup},
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L. A. Beklaryan. Groups of homeomorphisms of the line. Criteria for the existence of invariant and projectively invariant measures in terms of the commutator subgroup. Sbornik. Mathematics, Tome 205 (2014) no. 12, pp. 1741-1760. http://geodesic.mathdoc.fr/item/SM_2014_205_12_a3/

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