Mean Value from Representation of Rational Number as Sum of Two Egyptian Fractions

For given positive integers $n$ and $a$, let $R(n;\,a)$ denote the number of positive integer solutions $(x,\,y)$ of the Diophantine equation $${a\over n}={1\over x}+{1\over y}.$$ Write $$S(N;\,a)=\sum_{\substack{n\leq N (n,\,a)=1}}R(n;\,a).$$ Recently Jingjing Huang and R. C. Vaughan proved that for $4\leq N$ and $a\leq 2N$, there is an asymptotic formula $$S(N;\,a)={3\over \pi^2a}\prod_{p|a}{p-1\over p+1}\cdot N(\log^2N+c_1(a) \log N+c_0(a))+\Delta(N;\,a).$$ In this paper, we shall get a more explicit expression with better error term for $c_0(a)$

Comment on "Critique and correction of the currently accepted solution of the infinite spherical well in quantum mechanics" by Huang Young-Sea and Thomann Hans-Rudolph

We comment on the paper "Critique and correction of the currently accepted solution of the infinite spherical well in quantum mechanics" by Huang Young-Sea and Thomann Hans-Rudolph, EPL 115, 60001 (2016) .Comment: 2 pages; Submitted to the Comments Section of EP

Sergio F. Martínez y Xiang Huang. 2015. Hacia una Filosofía de la Ciencia Centrada en Prácticas

Review of Sergio F. Martínez y Xiang Huang. 2015. Hacia una Filosofía de la Ciencia Centrada en Práctica

2014-2015 Senior Recital - Heqing Huang (Piano)

El curso de PROSPECTIVA ESTRATEGICA brinda las herramientas para poder predecir y comprender el comportamiento futuro de las variables que afectan los procesos organizacionales.La prospectiva trata de ir adaptándose paulatinamente al cambio de los escenarios e ir creando ventajas competitivas con ciclos de vida predeterminado