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 about Psi (ψ)
Which LaTeX code should I use for Psi?
For the Psi symbol (ψ), 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 can I use the Psi symbol?
The Psi symbol (ψ) is typically used:
- In mathematical equations (math mode)
- In regular text (if supported)
- In various LaTeX environments
Can I use the Psi symbol in display mode?
Yes, the Psi symbol (ψ) works in display mode (between $$ $$). This allows you to render the symbol on its own line with better visibility.
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