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A Continuous Extension that preserves Concavity, Monotonicity and Lipschitz Continuity

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Andrés Carvajal () (Yale University and Royal Holloway, University of London)

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Abstract

The following is proven here: let W : X × C ? R, where X is convex, be a continuous and bounded function such that for each y?C, the function W (·,y) : X ? R is concave (resp. strongly concave; resp. Lipschitzian with constant M; resp. monotone; resp. strictly monotone) and let Y?C. If C is compact, then there exists a continuous extension of W, U : X × Y ? [infX×C W,supX×C W], such that for each y?Y, the function U(·,y) : X ? R is concave (resp. strongly concave; resp. Lipschitzian with constant My; resp. monotone; resp. strictly monotone).

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Paper provided by Department of Economics, Royal Holloway University of London in its series Royal Holloway, University of London: Discussion Papers in Economics with number 04/27.

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Length: 15 pages
Date of creation: Nov 2004
Date of revision: Nov 2004
Handle: RePEc:hol:holodi:0427

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  1. Howe, Roger, 1987. "Sections and extensions of concave functions," Journal of Mathematical Economics, Elsevier, vol. 16(1), pages 53-64, February. [Downloadable!] (restricted)
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