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Abstract：
Strict proof is given to single valley character of level degree function by use of convex analysis theory, which provides reliable theoretical basis for the optimization of the data processing with respect to level degree. As circle degree and cylindrical degree have the same mathematical structures, their single valley character can be proved by the same method.
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Journal of Dong Hua University (English Edition)
ISSN： 1672-5220
CN： 31-1920/TS
Year： 2004
Issue： 4
Volume： 21
Page： 153-155
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ESI Highly Cited Papers on the List： 0 Unfold All
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30 Days PV： 1
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