2 articles for “Wallis formula”

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Research ArticleOpen accessEvery word in the titleElementary Combinatorial-Probabilistic Proof of the Wallis and Stirling FormulasMikhail KovalyovThis short note provides a remarkably simple derivation of the Wallis and Stirling formulas based on elementary estimates applied to binomial coefficients. As a byproduct an elementary proof of the central limit theorem for the binomial distribution is also obtained. …Journal of Mathematics and Statistics, Vol. 5, Issue 4 · 31 Dec 2009 · 8,081 accessesView PDF Cite

Research ArticleOpen accessIn the abstractA Mother Plant and Somatic Embryo Registry for the Propagation and Conservation of Artificial Seeds of the Orchid Phragmipedium kovachiiOsber Cunia, Manuel Oliva, Segundo G. Chavez et al.Phragmipedium kovachii, is an endemic orchid that naturally inhabits the humid zones of the Amazonas region in Peru. Currently, it has been extracted from its natural habitat, listed as critically endangered by CITES, suggesting searching for conservation strategies in vitro and in situ. Therefore, this research established an in vitro protocol to obtain and conserve artificial seed, through four events: … …OnLine Journal of Biological Sciences, Vol. 24, Issue 4 · 8 Jul 2024 · 5,302 accessesView PDF Cite