Skip to main content
Log in

On Some Convergence to the Constant \(\varvec{e}\) and Proof of Keller’s Limit

  • Published:
Results in Mathematics Aims and scope Submit manuscript

Abstract

A new asymptotic formula for the constant e is proposed by the continued fraction approximation. As a consequence, we deduce inequalities for the sequence \((1+1/n)^n\), and show an application of the inequalities to the proof of Keller’s limit. Numerical computations and comparisons are conducted to illustrate the superiority of our new inequalities.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. Abramowitz, M., Stegun, I. A.: Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Nation Bureau of Standards, Applied Mathematical Series 55, 9th printing. Dover, New York (1972)

  2. Hu, Y.: A strengthened Carleman’s inequality. Commun. Math. Anal. 1(2), 115–119 (2006)

    MathSciNet  MATH  Google Scholar 

  3. Lu, D., Song, L., Liu, Z.: Some new approximations and inequalities of the sequence \((1+1/n)^n\) and improvements of Carlemans inequality. Ramanujan J. 43(1), 69–82 (2017)

    Article  MathSciNet  MATH  Google Scholar 

  4. Lu, D., Song, L., Ma, C.: A generated approximation of the gamma function related to Windschitl’s formula. J. Number Theory 140, 215–225 (2014)

    Article  MathSciNet  MATH  Google Scholar 

  5. Lu, D., Wang, X.: A new saymptotic expansion and some inequalities for the gamma function. J. Number Theory 140, 314–323 (2014)

    Article  MathSciNet  Google Scholar 

  6. Lu, D.: Some new convergent sequences and inequalities of Euler’constant. J. Math. Anal. Appl. 419(1), 541–552 (2014)

    Article  MathSciNet  MATH  Google Scholar 

  7. Mortici, C.: A new Stirling series as continued fraction. Numer. Algorithms 56(1), 17–26 (2011)

    Article  MathSciNet  MATH  Google Scholar 

  8. Mortici, C.: Fast convergences towards Euler–Mascheroni constant. Comput. Appl. Math. 29(3), 479–491 (2010)

    Article  MathSciNet  MATH  Google Scholar 

  9. Mortici, C., Hu, Y.: On some convergences to the constant \(e\) and improvements of Carleman’s inequality. Carpathian J. Math. 31(2), 249–254 (2015)

    MathSciNet  MATH  Google Scholar 

  10. Mortici, C.: Improved asymptotic formulas for the gamma function. Comput. Math. Appl. 61(11), 3364–3369 (2011)

    Article  MathSciNet  MATH  Google Scholar 

  11. Mortici, C.: On Ramanujans large argument formula for the gamma function. Ramanujan J. 26(2), 185–192 (2011)

    Article  MathSciNet  MATH  Google Scholar 

  12. Mortici, C.: Product approximations via asymptotic integration. Am. Math. Mon. 117(5), 434–441 (2010)

    Article  MathSciNet  MATH  Google Scholar 

  13. Mortici, C.: Sharp bounds of the Landau constants. Math. Comput. 80(274), 1011–1018 (2011)

    Article  MathSciNet  MATH  Google Scholar 

  14. Mortici, C., Villarino, M.B.: On the Ramanujan–Lodge harmonic number expansion. Appl. Math. Comput. 251, 423–430 (2015)

    MathSciNet  MATH  Google Scholar 

  15. Ping, Y., Sun, G.: A strengthened Carleman’s inequality. J. Math. Anal. Appl. 240(1), 290–293 (1999)

    Article  MathSciNet  MATH  Google Scholar 

  16. Pólya, G., Szegö, G.: Problems and Theorems in Analysis, vol. I. Springer, New York (1972)

    Book  MATH  Google Scholar 

  17. Sandor, J.: On certain inequalities involving the constant \(e\) and their applications. J. Math. Anal. Appl. 249(2), 569–582 (2000)

    Article  MathSciNet  MATH  Google Scholar 

  18. Yang, B., Debnath, L.: Some inequalities involving the constant \(e\) and an application to Carleman’s inequality. J. Math. Anal. Appl. 223(1), 347–353 (1998)

    Article  MathSciNet  MATH  Google Scholar 

  19. Yang, X.: On Carleman’s inequality. J. Math. Anal. Appl. 253(2), 691–694 (2001)

    Article  MathSciNet  MATH  Google Scholar 

Download references

Acknowledgements

Computations made in this paper were performed using Maple software. The research of the Dawei Lu was supported by the National Natural Science Foundation of China (Grant Nos. 11371077 and 11571058). The research of the fourth author was supported by the National Natural Science Foundation of China (Grant No. 11471065).

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Dawei Lu.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Fang, S., Lai, L., Lu, D. et al. On Some Convergence to the Constant \(\varvec{e}\) and Proof of Keller’s Limit. Results Math 73, 69 (2018). https://doi.org/10.1007/s00025-018-0831-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s00025-018-0831-8

Mathematics Subject Classification

Keywords

Navigation