Krassimir Atanassov

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

Volume 17, 2011, Number 4, Pages 69—72

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## Details

### Authors and affiliations

*Bioinformatics and Mathematical Modelling Department
Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences
Acad. G. Bonchev Str., Bl. 105, Sofia-1113, Bulgaria
*

### Abstract

Two inequalities connecting φ and ψ-functions are formulated and proved.

### Keywords

- Arithmetic functions
*φ*,*ψ*and*σ*

### AMS Classification

- 11A25

### References

- Atanassov, K. Note on φ, ψ and σ-functions. Notes on Number Theory and Discrete Mathematics, Vol. 12, 2006, No. 4, 25–28.
- Atanassov, K. Note on φ, ψ and σ-functions. Part 2. Notes on Number Theory and Discrete Mathematics, Vol. 16, 2010, No. 3, 25–28.
- Atanassov, K. Note on φ, ψ and σ-functions. Part 3. Notes on Number Theory and Discrete Mathematics, Vol. 17, 2011, No. 3, 13–14.
- Nagell, T. Introduction to Number Theory, John Wiley & Sons, New York, 1950.

## Related papers

## Cite this paper

APAAtanassov, K. (2011). Note on φ, ψ and σ-functions. Part 4. Notes on Number Theory and Discrete Mathematics, 17(4), 69-72.

ChicagoAtanassov, Krassimir. “Note on φ, ψ and σ-functions. Part 4.” Notes on Number Theory and Discrete Mathematics 17, no. 4 (2011): 69-72.

MLAAtanassov, Krassimir. “Note on φ, ψ and σ-functions. Part 4.” Notes on Number Theory and Discrete Mathematics 17.4 (2011): 69-72. Print.