Two-dimensional extremal surfaces with jointly extremal partial derivatives (Q1178066)
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scientific article; zbMATH DE number 22776
| Language | Label | Description | Also known as |
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| English | Two-dimensional extremal surfaces with jointly extremal partial derivatives |
scientific article; zbMATH DE number 22776 |
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Two-dimensional extremal surfaces with jointly extremal partial derivatives (English)
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26 June 1992
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Earlier Kovalevskaya introduced the notion of jointly extremal partial derivatives. In the present paper the authors prove the theorem concerning the extremal character of two-dimensional surfaces which are set by smooth functions of two variables, while function quotient derivatives of the first order form jointly extremal diversities. The method of major and minor fields introduced by Sprindzhuk forms the basis of their research.
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two-dimensional surfaces
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jointly extremal partial derivatives
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