Krassimir T. Atanassov

Notes on Number Theory and Discrete Mathematics, ISSN 1310-5132

Volume 12, 2006, Number 4, Pages 23—24

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## Details

### Authors and affiliations

Krassimir T. Atanassov

*CLBME – Bulg. Academy of Sci.
P.O.Box 12, Sofa-1113, Bulgaria*

### Abstract

In the present remark we shall formulate and discuss some extremal problems, related to arithmetic functions *φ*, *ψ* and *σ* (see, e.g., [1]).

### References

- Nagell T., Introduction to number theory, John Wiley & Sons, New York, 1950.

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## Cite this paper

APAAtanassov, K. T. (2006). Note on *φ*, *ψ* and *σ* functions. Notes on Number Theory and Discrete Mathematics, 12(4), 23-24.

Atanassov, Krassimir T. “Note on *φ*, *ψ* and *σ* Functions.” Notes on Number Theory and Discrete Mathematics 12, no. 4 (2006): 23-24.

Atanassov, Krassimir T. “Note on *φ*, *ψ* and *σ* Functions.” Notes on Number Theory and Discrete Mathematics 12.4 (2006): 23-24. Print.