LaTeX Integral (∫) - 完整指南

The integral symbol (∫) represents integration in calculus.

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∫

Integral

LaTeX Code

Method 1: Using \int

No package required

Recommended

\int

Integral symbol

Method 2: Using \iint

No package required

\iint

Double integral

Method 3: Using \iiint

No package required

\iiint

Triple integral

LaTeX Integral 是什么？

The integral symbol (∫) is fundamental to calculus and is used for both definite and indefinite integrals. Multiple integrals can be denoted with multiple integral signs.

如何在 LaTeX 中使用 Integral

方法 1：使用 \int

✅无需额外包

Integral symbol

示例：使用 \int

latex

\documentclass{article}

\begin{document}

% Using the Integral
Text with \int

\end{document}

方法 2：使用 \iint

✅无需额外包

Double integral

示例：使用 \iint

latex

\documentclass{article}

\begin{document}

% Using the Integral
Text with \iint

\end{document}

方法 3：使用 \iiint

✅无需额外包

Triple integral

示例：使用 \iiint

latex

\documentclass{article}

\begin{document}

% Using the Integral
Text with \iiint

\end{document}

常见用途

Integral 符号通常用于以下情况：

Indefinite Integral

Antiderivative.

Code

$\int x^2 dx = \frac{x^3}{3} + C$

Output

∫ x² dx = x³/3 + C

Definite Integral

Area under curve.

Code

$\int_0^1 x^2 dx = \frac{1}{3}$

Output

∫₀¹ x² dx = 1/3

完整示例

Definite Integral

Definite integral calculation

latex

\documentclass{article}
\begin{document}

Compute the definite integral:
$$\int_0^2 x^2 dx = \left[\frac{x^3}{3}\right]_0^2 = \frac{8}{3}$$

\end{document}