Recent problems by Ovidiu Furdui
- 1. Proposed problem to Mathematics Magazine, in press,
pdf
- 2. Proposed problem to Crux Mathematicorum with Mathematical Mayhem, Published, Vol. 34, February 2008, pdf
- 3. Proposed problem to Mathematics Magazine, in press, pdf
- 4. Proposed problem to Crux Mathematicorum with Mathematical Mayhem, Published as Problem 3357, September 2008, pdf
- 5. Proposed problem to La Gaceta de la RSME,
Published, pdf
- 6. Proposed problem to The College Mathematics Journal,
Published, pdf
- 7. Proposed problem to The Fibonacci Quarterly,
Published, pdf
- 8. Proposed problem to Crux with Mayhem, in press, pdf
- 9. O formula trigonometrica,
A
trigonometric identity, pdf
- 10. Proposed problem to Mathematical Magazine, in press, pdf
- 11. Proposed problem to La Gaceta de la RSME,
Published, pdf
- 12. A quadratic exponential sum, pdf
- 13. Proposed problem to Mathematical Reflections, in press, pdf
- 14. Proposed problem to Publ.Elek.Fak., in press, pdf
- 15. Proposed problem to PME Journal, Published, pdf
- 16. Proposed problem to Math Horizon, in press, pdf
- 17. Proposed problem to Mathematical Reflections, in press, pdf
- 18. Proposed problem to Elemente der Mathematik, in press, pdf
- 19. Proposed problem to The American Mathematical Monthly, in press, pdf
- 20. Proposed problem to La Gaceta de la RSME,
Published, pdf
- 21. Proposed problem to REOIM, Published, pdf
- 22. Proposed problem, The College
Mathematics Journal, Published as Problem 877, May 2008, pdf
- 23. A series representation of the Catalan constant, pdf
- 24. Proposed problem, MJMS, A Leibniz series,
Published, pdf
- 25. Two series representations of the Glaisher-Kinkelin constant, pdf
- 26. Proposed problem, Mathematics Magazine, Problem 1784, Mathematics Magazine, Vol.80, December 2007, pdf
- 27. The limit of a product, pdf
- 28. Another Leibniz Series, Published, pdf
- 29. Proposed problem, The American Mathematical Monthly,
Published, pdf
- 30. Proposed problem, The American Mathematical Monthly,
Published, pdf
- 31. A Ramanujan-like-formula, AADM, in press, pdf
- 32. Proposed problem, Crux with Mayhem, A Zeta limit, in press, pdf
- 33. Proposed problem, Mathematics Magazine, A Double Improper Integral, in press, pdf
- 34. Proposed problem, The Mathematical Gazette, An Improper Integral,
To appear, pdf
- 35. Proposed problem, Siam Problems and Solutions, in press, pdf
- 36. A generalization of a Dostanic-Zhu lemma, pdf
- 37. Proposed problem, Math Horizon, An alternating series, in press, pdf
- 38. A sequence of rational numbers, pdf
- 39. Proposed problem, Revista Escolar, A Riemann integral,
Published, pdf
- 40. An integral, pdf
- 41. Proposed problem, La Gaceta de la RSME,
A multiple harmonic series, in press, pdf
- 42. Proposed problem, Crux with Mayhem, A geometry problem, in press, pdf
- 43. Proposed problem, Revista Escolar, A double fractional integral,
Published, pdf
- 44. Proposed problem, Siam Problems and Solutions,
Published, pdf
- 45. Proposed problem, Niew Archief Voor Wiskunde,
To appear, pdf
- 46. Proposed problem, Mathematics Magazine, in press, pdf
- 47. Two log limits, pdf
- 48. A simple limit, pdf
- 49. The limit of an integral, pdf
- 50. New, A conjecture in solid geometry***,
An interior point characterization of regular tetrahedra, Crux with mayhem, in press, pdf
- 51. New ***, Proposed problem,
The limit of two $n^{th}$ roots, The
American Mathematical Monthly, Published, Vol. 115, January 2008, pdf
- 52. New **, Proposed problem, Mathematics Magazine,
A convergence criteria for
improper integrals, To appear, October 2008, pdf
- 53. New ***, Proposed Problem, Nieuw Archief Voor Wiskunde, pdf
- 54. New **, Proposed Problem,
A Riemann Zeta Series, Siam Problems and Solutions,
Submitted, pdf
- 55. New****,
Proposed Problem, La Gaceta de la RSME, Published, Vol. 11, Number 1, 2008, pdf
, pdf
- 56. New, Proposed Problem, PME Journal, To appear, Problem 1172, Spring 2008, pdf
- 57. New, Proposed Problem, Nieuw Archief Voor Wiskunde, A logarithmic series,
Submitted, pdf
- 58. New, Proposed Problem, School Science and Mathematics, A
logarithmic integral,
Published, pdf
- 59. New, A quickie, pdf
- 60. New **, Proposed Problem, La Gaceta de la RSME,
A criteria for convergence of
some exponential integrals, pdf
- 61. New, Proposed Problem, PME Journal, submitted, pdf
- 62. New, Proposed Problem, pdf
- 63. New***, Proposed Problem, The Harvard College Mathematics Review,
A tricky limit,
Published, pdf
- 64. New, Proposed Problem, CMJ,
Two Logarithmic Series, Published, Vol. 39, No.2, March 2008, pdf
- 65. New**, Proposed Problem, Mathematics
Magazine,
The Limit of Three Square Roots, Published , pdf
- 66. New, Proposed Problem, Revista Escolar, Published, Problema 155, Numero 31, 2008, pdf
- 67. New, Proposed Problem, Revista Escolar, Submitted, pdf
- 68. New, Proposed Problem, School Science and Mathematics,
Published, pdf
- 69. 10 ale lunii Noiembrie, 2007, November 10, 2007, New ***,
Two Riemann Zeta Limits,
pdf
- 70. 10 ale lunii Noiembrie, 2007, November 10, 2007, Problem A, Nieuw Archief voor Wiskunde, 5/9, Maart 2008,
pdf
- 71. 12 ale lunii Noiembrie, 2007, November 12, 2007, New, Proposed Problem, Mathematics Magazine, A "quick" diophantine equation,
To appear , April 2008, Q980,
pdf
- 72. 12 ale lunii Noiembrie, 2007, November 12, 2007, New, A "quick" fractional integral,
pdf
- 73. 15 ale lunii Noiembrie, 2007, November 15, 2007, New, Proposed Problem, MJMS,
To appear, pdf
- 74. 30 ale lunii Noiembrie, 2007, November 30, 2007, New, A Stirling type formula for the n^{th} root of the product of the binomial coefficients, The Mathematical Gazette,
To appear, pdf
- 75. 5 ale lunii Decembrie, 2007, December 5, 2007, New***, The Convergence of Two Multiple Series
pdf
- 76. 7 ale lunii Decembrie, 2007, December 7, 2007, New***, Proposed Problem, AADM, A Conjecture, The diedral angle characterization of regular tetrahedra,
pdf
- 77. 13 ale lunii Decembrie, 2007, December 13, 2007, New, To appear, The American Mathematical Monthly,
pdf
- 78. 28 ale lunii Decembrie, 2007, December 28, 2007, School Science and Mathematics, pdf, Published as Problem 5013, Vol. 103, March, 2008, pdf
2008
- 79. 2 Ianuarie, 2008, January 2, 2008, Proposed Problem, Some Cosine Integral Series
, SIAM, Published, pdf
- 80. 3 Ianuarie, 2008, January 3, 2008, Proposed Problem, A Multiple Alternating Series
, Crux Mathematicorum with Mathematical Mayhem, Submitted, pdf
- 81. 9 Ianuarie, 2008, January 9, 2008, Proposed Problem, A Curious Product
, The American Mathematical Monthly, Published pdf
- 82. 14 Ianuarie, 2008, January 14, 2008, Proposed Problem, The Mathematical Gazette, To appear, pdf
- 83. 1 Februarie, 2008, February 1, 2008, Proposed Problem, La Gaceta de la RSME, Published as Problema 103, Vol. 11, No.2, 2008, pdf
- 84. 4 Februarie, 2008, February 4, 2008, A Diophantine Equation, Published in The Harvard College Mathematics Review, Vol.2, No.1, Spring 2008,
pdf
- 6 Mai, 2008, May 6, 2008, An Interesting Generalization,
pdf
- 85. 15 Februarie, 2008, February 15, 2008, Proposed Problem, Crux Mathematicorum with Mathematical Mayhem,
pdf
- 86. 27 Februarie, 2008, February 27, 2008, Proposed Problem, The Mathematical Gazette, To appear, November 2008,
pdf
- 87. 1 Martie, 2008, March 1, 2008, Proposed Problem, Crux Mathematicorum with Mathematical Mayhem, Submitted, pdf
- 88. 11 Martie, 2008, March 11, 2008, Proposed Problem, La Gaceta de la RSME, A class of double integrals, Published, pdf
- 89***. 8 Aprilie, 2008, April 8, 2008, Proposed Problem, The American Mathematical Monthly, Submitted, pdf
- 90. 12 Aprilie, 2008, April 12, 2008, Proposed Problem, La Gaceta de la RSME, An alternating series with gaps,
pdf
- 91. 14 Aprilie, 2008, April 14, 2008, Proposed Problem, Crux Mathematicorum with Mathematical Mayhem, A Taylorian alternating series,
pdf
- 92. 5 Mai, 2008, May 5, 2008, Summing Some Zeta Series,
pdf
- 93. 7 Mai, 2008, May 7, 2008, Proposed Problem, Elemente der Mathematik, Accepted for publication, pdf
- 94. 8 Mai, 2008, May 8, 2008, A Stirling Type Product-An Unexpected Result, pdf
Probleme pentru vacanta de vara 2008
- 95. 13 Mai, 2008, May 13, 2008, A Glaisher Kinkelin Product, , To appear, pdf
- 96. 23 Mai, 2008, May 23, 2008, Proposed Problem, Mathematical Reflections, Published as Problem U 95 pdf
- 97. 17 Mai, 2008, May 17, 2008, Proposed Problem, Revista Escolar, pdf, Some generalizations, pdf
- 98. 26 Mai, 2008, May 26, 2008, Proposed Problem, Revista Escolar, Published as Problema 157, pdf
- 99. 27 Mai, 2008, May 27, 2008, Proposed Problem, The College Mathematics Journal, Accepted for publication, pdf
Semestrul de toamna 2008
- 100. 27 August, 2008, August 27, 2008, A Multiple Limit, pdf
- 101. 2 Septembrie, 2008, September 2, 2008, Proposed Problem to Crux with Mayhem, pdf
- 102. New, Proposed Problem, The American Mathematical Monthly, pdf
- Another problem on a related topic, pdf
- An exponential limit, pdf
- 103. A double integral of a logarithmic gamma function, Accepted for publication, pdf
- 104. An integral, a limit and a geometric mean, pdf
- 105. Proposed Problem , Crux Mathematicorum with Mathematical Mayhem, pdf
- 106. Proposed Problem, School Science and Mathematics, pdf
- 107. Proposed Problem, Siam Problems and Solutions , pdf
- 108. Proposed Problem, Crux with Mayhem, pdf
- 109. Proposed Problem, La Gaceta de la RSME, pdf
- Limits of quadratic type sequences, pdf
- 110. Proposed Problem, The College Mathematics Journal, To Appear, pdf
- 111. Proposed Problem, Crux Mathematicorum with Mathematical Mayhem, Submitted, pdf
- 112. Proposed Problem, Crux Mathematicorum with Mathematical Mayhem, Submitted, pdf
- 113. Proposed Problem, Mathematics Magazine, A Double Alternating Series, pdf
- 114. Proposed Problem, SSM, A Simple Alternating Series, pdf
Limits, Integrals and Series
1. A Gamma Function limit, pdf
2. A curious limit, pdf
3. An alternanting sum, pdf
4. 7 Ianuarie, 2008, January 7, 2008, Three Logarithmic Series
, pdf
5. 18 Ianuarie, 2008, January 18, 2008, O Limita Frumoasa
, pdf
6. 29 Februarie, 2008, February 18, 2008, A Multiple Integral, pdf
7. 14 Aprilie, 2008, April 14, 2008, Some Classes of Taylorian Alternating Series,
pdf
8. 10 Mai, 2008, May 14, 2008, The Convergence of some Lalescu series,
pdf
Gems, Mathematical Techniques, Intriguing Results
- 1. An integral formula, pdf
- 2. A Convergence Criteria, The Brazilian problem, pdf
- 3. Some "Exponential" limits, pdf
- 4. An interesting sequence, pdf
- 5. Some tauberian limits, pdf
- 6. A nice sum, pdf
- 7. 7 Aprilie, 2008, April 7, 2008, Holder's inequality implies AM-GM inequality, pdf
Quickies
- 1. A Quick Harmonic Sum, A problem from Ungheria, pdf
Open Problems
- 1. Some improper integrals, pdf
- 2. A multiple Riemann integral, pdf
- 3. The limit of a difference of two n^{th} roots of Gamma functions, pdf
- 4. Some alternating series, pdf
- 5. 22 ale lunii Noiembrie, 2007, November 22, 2007, A double alternating series, New, pdf
- 6. 23 ale lunii Noiembrie, 2007, November 23, 2007, A difficult double series, New, pdf
- 7. 25 ale lunii Noiembrie, 2007, November 25, 2007, A multiple series, New, pdf
- 8. 28 ale lunii Decembrie, 2007, December 28, 2007, An alternating series involving Gamma and Gamma, New, pdf
- 9. 25 ale lunii Noiembrie, 2007, November 25, 2007, The asymptotic behavior of two sequences, (Not yet posted).
- 10. 1 Ianuarie, 2008, January 1, 2008, An alternating series involving Zeta function, pdf
- 11. 23 Februarie, 2008, February 23, 2008, A fractional integral and its generalization, pdf
- 12. 25 Februarie, 2008, February 25, 2008, A multiple fractional integral, pdf
- 13. 25 Februarie, 2008, February 25, 2008, When two generalized harmonic numbers are divisible?,
(Not yet posted). pdf
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