LaTeX Psi (ψ) - Complete Guide
The Greek letter psi (ψ/Ψ) is used in quantum mechanics for wave functions and in psychology.
Symbol Preview
Psi
LaTeX Code
No package required
\psiLowercase psi
No package required
\PsiUppercase psi
What is the LaTeX Psi?
Psi is the twenty-third letter of the Greek alphabet. In quantum mechanics, ψ represents the wave function of a quantum system. In psychology, Psi is the symbol for psychology itself. It also appears in various mathematical and physical contexts.
How to Use Psi in LaTeX
Method 1: Using \psi
✅No package required
Lowercase psi
Example: Using \psi
\documentclass{article}
\begin{document}
% Using the Psi
Text with \psi
\end{document}Method 2: Using \Psi
✅No package required
Uppercase psi
Example: Using \Psi
\documentclass{article}
\begin{document}
% Using the Psi
Text with \Psi
\end{document}Common Use Cases
The Psi symbol is commonly used in the following contexts:
Wave Function
Represents quantum wave function.
Code
Schrödinger equation: $i\hbar\frac{\partial\psi}{\partial t} = -\frac{\hbar^2}{2m}\nabla^2\psi + V\psi$Output
Schrödinger equation involves ψ (wave function)
Dihedral Angle
Used for dihedral angles in chemistry.
Code
Dihedral angle: $\psi$Output
Dihedral angle: ψ
Complete Examples
Wave Function Normalization
Quantum mechanics wave function
\documentclass{article}
\begin{document}
A wave function $\psi(x)$ must be normalized: $\int_{-\infty}^{\infty} |\psi(x)|^2 dx = 1$
\end{document}Frequently Asked Questions
Which method should I use?
We recommend using the method marked as "Recommended" above. However, the best method depends on your specific needs:
- \psi: Lowercase psi
- \Psi: Uppercase psi
Where do I use this symbol?
This symbol can be used:
- In mathematical equations (math mode)
- In regular text (if using text mode)
- In various document environments
Can I use this in display mode?
Yes, symbols that work in math mode (between $ $) also work in display mode (between $$ $$). This allows you to display the symbol on its own line with larger formatting.
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