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Khan, M. Ali
Sagara, Nobusumi
Year of Publication: 
Series/Report no.: 
Working Paper No. 593
The Johns Hopkins University, Department of Economics, Baltimore, MD
This paper offers a sufficient condition, based on Maharam (1942) and re-emphasized by Hoover-Keisler (1984), for the validity of Lyapunov's (1940) theorem on the range of an atomless vector measure taking values in an infinite-dimensional Banach space that is not necessarily separable nor has the RNP property. In particular, we obtain an extension of a corresponding result due to Uhl (1969). The proposed condition is also shown to be necessary in the sense formalized in Keisler-Sun (2009), and thereby closes a question of long-standing as regards an infinite-dimensional generalization of the theorem. The result is applied to obtain short simple proofs of recent results on the convexity of the integral of a set-valued function, and on the characterization of restricted cores of a saturated economy.
Saturated measure space
Lyapunov's theorem
integral of correspondences
measurable selection
Radon-Nikodym property
saturated economy
restricted cores
Document Type: 
Working Paper

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