Physics Elliptical Motion in Classical Mechanics
This article consider elliptical motion in three-dimensional space. Typically, it would be the motion of a planet orbiting a large star such as the Sun.
Physics
Physics 
Physics Uniform Circular Motion in the Theory of Relativity
This article explain the theory of uniform circular motion in classical mechanics and extend it to the case of the theory of relativity.
Physics Free Fall in the Theory of Relativity
The falling motion caused only by gravity, ignoring the effects of air resistance and friction, is called free fall. Find the equation of motion for free fall in the theory of relativity.
Analysis Complex Functions and Schrödinger Equation
A short story about the title of the author's book "Complex Functions and the Schrödinger Equation".
Physics Harmonic Oscillator and Schrödinger Equation
This article explains what kind of probability distribution the Schrödinger equation for the harmonic oscillator expresses, and presents an interpretation of the solution.
Physics Schrödinger Equation in the Free State
Let us solve the Schrödinger equation to find how the probability distribution of the coordinates at which the electron is detected changes in the free state.