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Sign preservation for a function of two variables

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References

  1. Yu. E. Anikonov, Certain Methods for Studying Inverse Problems in Many Dimensions [in Russian], Nauka, Novosibirsk (1978).

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  2. A. N. Kolmogorov and S. V. Fomin, Elements of the Theory of Functions and Functional Analysis [in Russian], Nauka, Moscow (1968).

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Authors
  1. D. A. Trotsenko
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Additional information

The author's research was supported by the Russian Fund for Fundamental Research under the grant 93-011-181.

Novosibirsk. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 34, No. 4, pp. 200–206, July–August, 1993.

Translated by N. S. Dairbekov

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Trotsenko, D.A. Sign preservation for a function of two variables. Sib Math J 34, 770–775 (1993). https://doi.org/10.1007/BF00975182

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  • DOI: https://doi.org/10.1007/BF00975182

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