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B. H. Lei
君子欲讷于言而敏于行

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Browse notes chronologically.

2026little time capsule
Fourier Multipliers as Operators
Index Notation and Embedded Surfaces
What does $x^{\prime}$ mean in a Green’s function? — a linear algebra and operator view
人应该怎样度过一生 一
From the Spectral Dirichlet-Neumann Symbol to the Physical-Space Operator Identity
Hankel Diagonalization of the Radial Bessel Operator
Fourier Coefficients of Quadratic Forms in $\cos \gamma$ for Steady Capillary-Gravity Waves
Diagonalizing Azimuthal Mode Coupling via a Discrete Fourier Transform
Cartesian Derivatives in Azimuthal Fourier–Hankel Space
DFT Method Main
Axisymmetric Angular Fourier Modes and Hankel Transform of a Radial Heaviside Pressure Field
UK Driving School & Car Words
2025little time capsule
Add Two Numbers - References in Python (with C++ Comparisons)
two sum decorators
two sum type annotation
two sum
无名树
Self Adjoint Operators
Azimuthal Fourier Analysis
Operator Ladder Relations for Hankel Transforms of Bessel Type
浮云记
settings for PINN
Surface Waves Generated by A Travelling Pressure Point
Ray Geometry, and Wave Action in Uniform Currents
Phase Geometry of Ship Waves: Deriving $p=a \cos ^2 \theta$
c++ debug notes
note for python I
One Dimension Ship Wave With Surface Tension
mathjax align vs align* vs aligned
English in Paper
Relations among Rays, Group Velocity, Phase Velocity, and the Wave Number Vector in Water Waves
Pressure Forcing on a Free Surface and Far-Field Waves in Lamb’s Hydrodynamics
Wave Patterns from Ray Theory: Centered Waves, Wake Angles, and Phase Geometry
Gaussian Integrals and Related Fourier–Bessel Identities
我的小院
回乡偶书二首
归园田居 其一
Hankel Transform of the Bi-Laplacian and an Axisymmetric Free-Surface Problem
2024little time capsule
Gamma, Polygamma, Hurwitz Zeta, and Bessel Function Identities
Continuity and Momentum Equations in Eulerian Form and Their Link to Hydraulic Jumps
casting operators
operator type and overloading -part III
operator type and overloading -part II
operator type and overloading -part I
polymorphism -3
polymorphism -2
polymorphism -1
implementing Inheritance - Q&A
Inheritance
basics of inheritance - part 2
basics of inheritance - part 1
union & struct & aggregate & constexpr
union and struct
constructor -3
constructor -2
constructor and shadow copying
function
Arrays and Strings
Introduction -2
Introduction
Beginner's Guide to C++ Basics
Eulerian and Lagrangian Forms of the Continuity and Momentum Equations
The Equations for Water Waves (Linear and Nonlinear Waves)
stellar+twikoo配置最新评论以及配置live2d
Dyadic Products, Tensor Operations, and Surface Geometry in Euclidean Space
Levi-Civita Symbol, Cross and Wedge Products, Hodge Star, and Metric Components
stellar user manual