Geodesic
Cohomology groups, multipliers and factors in ergodic theory
Studia Mathematica, Tome 122 (1997) no. 3, pp. 275-288

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DOI

The problem of compact factors in ergodic theory and its relationship with the problem of extending a cocycle to a cocycle of a larger action are studied. 
M. Lemańczyk. Cohomology groups, multipliers and factors in ergodic theory. Studia Mathematica, Tome 122 (1997) no. 3, pp. 275-288. doi: 10.4064/sm-122-3-275-288
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