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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 776
Issue DateTitleAuthor(s)
2018Problems and solutions: a telescoping series with Inverse hyperbolic sine, solutionPlaza, Ángel 
2020Problems and solutions: a lower bound for a product of integralsPacheco, José M. ; Plaza, Ángel 
2018Problems and solutions: a generalization of a Fibonacci identityFalcón, Sergio ; Plaza, Ángel 
2018Advanced problems and solutions: closed forms for sums of series involving reciprocals of shifted Fibonacci squares, solutionPlaza, Ángel 
2018Elementary problems and solutions: power-mean and Jensen’s inequalities, solutionPlaza, Ángel 
2018Elementary problems and solutions: root and ratio tests, solutionPlaza, Ángel 
2018Advanced problems and solutions: sums of arc-tangents, solutionPlaza, Ángel 
2018Advanced problems and solutions: an upper bound for a sum of cubic roots, solutionPlaza, Ángel 
2018Advanced problems and solutions: the limit of an expression involving double factorials and Fibonacci numbers, solutionPlaza, Ángel 
2018Elementary problems and solutions: an infinite series of arctangent, proposedPlaza, Ángel 
2018Elementary problems and solutions: a problem with many solution, solution 2Plaza, Ángel ; Galante Sempere, David 
2017Advanced problems and solutions: a cyclic sum inequality, solutionPlaza, Ángel 
2017Elementary problems and solutions: lower Hessenberg matrix, solutionPlaza, Ángel 
2017Elementary problems and solutions: harmonic and Fiboancci/Lucas numbers, solution by Kenny B. Davenport, Dallas, PA.Plaza, Ángel 
2018Problems and solutions: a mean-value point, solutionPerdomo, Francisco ; Plaza, Ángel 
2018Elementary problems and solutions: Gelin-Cesáro identity yields a telescoping product, solutionPlaza, Ángel 
2018Elementary problems and solutions: an inequality with a cyclic sum, solutionPlaza, Ángel 
2018Elementary problems and solutions: simplifying a complicated expression, solution 3 by the proposerPlaza, Ángel 
2018Elementary problems and solutions: another application of the AM-GM inequality, solution 1Plaza, Ángel 
2019Problems and solutions: a divisibility property of Fibonacci numbers, solutionPlaza, Ángel 
Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 776