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Abstract: this paper is to give a simple, self-contained approach to this problem, giving back the subdifferential formula for (1.2) in [13] for example. Our idea will be to generalize von Neumann's result somewhat by asking which convex functions (rather than simply norms) are unitarily invariant: appropriately, the key idea will be a Fenchel conjugacy formula analogous to von Neumann's polarity formula (1.1): ffi oe: (For all ideas and notation from convex analysis we refer the reader to [8].)... (Update)
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0.0: Unknown - (Correct)
BibTeX entry: (Update)
@misc{ lewis-journal,
author = "Matrix Functions Lewis",
title = "Journal of Convex Analysis Volume 2 (1995), No.1/2, 173--183 The Convex
Analysis of Unitarily Invariant",
url = "citeseer.ist.psu.edu/765251.html" }
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