[Mathematics] Gaussian Integrals and Related Fourier–Bessel Identities

We collect closed-form formulas for one- and \(n\)-dimensional Gaussian integrals with linear and oscillatory terms, derive e...

Mathematics

我的小院

原想写一些剖析自我的文字,却不知如何下笔,也罢,就写写最近的杂绪吧。 早春,院子里的不知名的树依然光秃着树干,纹丝不动地点缀着视野里的红墙,肃杀而冷淡。又是一个冬去了,除却偶或光临的故乡的喜鹊,在小院凌乱的大戏台,唱着故园情、天涯愁。素常,小院是安静...

随想Reflections​

回乡偶书二首

回乡偶书二首贺知章少小离家老大回,乡音无改鬓毛衰。儿童相见不相识,笑问客从何处来。离别家乡岁月多,近来人事半销磨。唯有门前镜湖水,春风不改旧时波。清心瘦清泉

文学Anthology

归园田居 其一

归园田居 其一陶渊明少无适俗韵,性本爱丘山。误落尘网中,一去三十年。羁鸟恋旧林,池鱼思故渊。开荒南野际,守拙归园田。方宅十馀亩,草屋八九间。榆柳荫后檐,桃李罗堂前。暧暧远人村,依依墟里烟。狗吠深巷中,鸡鸣桑树颠。户庭无尘杂,虚室有馀闲。久在樊笼里,复...

文学Anthology

[Kelvin Wedge] Hankel Transform of the Bi-Laplacian and an Axisymmetric Free-Surface Problem

We show how the zeroth-order Hankel transform diagonalises the radial bi-Laplacian, clarify the sign convention \(\nabla^4 \leftrightarrow k^4\), and then apply the same transform machinery to an axisymmetric linear free-surface problem to obtain explicit representations for \(\eta(r,t)\) and \(\hat w(s,z,t)\).

Fluid Mechanics
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