LaTeX Lambda (λ) - Complete Guide
The Greek letter lambda (λ/Λ) is widely used in mathematics and physics for wavelength, eigenvalues, and lambda functions.
Symbol Preview
Lambda
LaTeX Code
No package required
\lambdaLowercase lambda symbol
No package required
\LambdaUppercase lambda symbol
What is the LaTeX Lambda?
Lambda is the eleventh letter of the Greek alphabet. It is extensively used in mathematics and physics: lowercase λ represents wavelength in physics and eigenvalues in linear algebra, while uppercase Λ appears in various mathematical contexts. Lambda functions in computer science are also named after this letter.
How to Use Lambda in LaTeX
Method 1: Using \lambda
✅No package required
Lowercase lambda symbol
Example: Using \lambda
\documentclass{article}
\begin{document}
% Using the Lambda
Text with \lambda
\end{document}Method 2: Using \Lambda
✅No package required
Uppercase lambda symbol
Example: Using \Lambda
\documentclass{article}
\begin{document}
% Using the Lambda
Text with \Lambda
\end{document}Common Use Cases
The Lambda symbol is commonly used in the following contexts:
Wavelength
Represents wavelength of electromagnetic radiation.
Code
Wavelength of visible light: $\lambda = 500$ nmOutput
Wavelength of visible light: λ = 500 nm
Eigenvalue
Used for eigenvalues in linear algebra.
Code
Find eigenvalues $\lambda$ such that $A\mathbf{v} = \lambda\mathbf{v}$Output
Find eigenvalues λ such that Av = λv
Decay Constant
Used in exponential decay formulas.
Code
$N(t) = N_0 e^{-\lambda t}$Output
N(t) = N₀ e^(-λt)
Complete Examples
Wave Equation
Lambda in wave equation
\documentclass{article}
\begin{document}
The relationship between wavelength, frequency, and speed: $c = \lambda \nu$, where $\lambda$ is wavelength and $\nu$ is frequency.
\end{document}Eigenvalue Problem
Lambda in eigenvalue problem
\documentclass{article}
\begin{document}
The characteristic equation is $\det(A - \lambda I) = 0$, where we solve for $\lambda$.
\end{document}Frequently Asked Questions about Lambda (λ)
Which LaTeX code should I use for Lambda?
For the Lambda symbol (λ), we recommend using the method marked as "Recommended" above. However, the best method depends on your specific needs:
- \lambda: Lowercase lambda symbol
- \Lambda: Uppercase lambda symbol
Where can I use the Lambda symbol?
The Lambda symbol (λ) is typically used:
- In mathematical equations (math mode)
- In regular text (if supported)
- In various LaTeX environments
Can I use the Lambda symbol in display mode?
Yes, the Lambda symbol (λ) works in display mode (between $$ $$). This allows you to render the symbol on its own line with better visibility.
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