Note on φ, ψ and σ-functions. Part 4

Krassimir Atanassov
Notes on Number Theory and Discrete Mathematics, ISSN 1310-5132
Volume 17, 2011, Number 4, Pages 69—72
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Authors and affiliations

Krassimir Atanassov

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

1. Atanassov, K. Note on φ, ψ and σ-functions. Notes on Number Theory and Discrete Mathematics, Vol. 12, 2006, No. 4, 23–24.
2. 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.
3. 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.
4. Nagell, T. Introduction to Number Theory, John Wiley & Sons, New York, 1950.