Multline and Align in LaTeX: Multi-line Equation Guide

Use align when multiple equation lines should line up at = or another relation. Use multline when one long equation needs to wrap but has no shared alignment point. Both environments come from the amsmath package.

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Which Multi-line Environment Should You Use?

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Align Equations at the Equals Sign

Place & immediately before each equals sign and use \\ to start the next equation line. The fragment below assumes amsmath is loaded in the preamble. Use align* instead of align when the equations should not be numbered. Avoid wrapping align inside equation; align is already a display-math environment.

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Break One Long Equation with multline

multline is for a single expression that is too wide for one line. It does not align at =. LaTeX places the first line toward the left, the final line toward the right, and any middle lines in the center. Use multline* for the same layout without an equation number.

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Give Several Aligned Lines One Equation Number

Put split inside equation when a derivation needs alignment but should be referenced as one equation. Unlike align, split cannot stand on its own.

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aligned vs split

Both environments create an aligned block and rely on an outer math environment. Use split for a full-width multi-line equation with one number. Use aligned when the block must sit beside another symbol, inside braces, or as part of a larger formula.

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Common Errors

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Practical Rules

• Align at a mathematical relation such as =, \leq, or \approx, not at arbitrary visual positions.
• Keep one & alignment scheme across related lines so the derivation is easy to scan.
• Use starred environments for unnumbered display math instead of removing numbers manually from every line.
• Add \label{...} only to lines that readers will reference; suppress decorative numbers with \notag.

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Try Multi-line Equations in LaTeX Cloud Studio

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Related Pages

• Equations
• Brackets and parentheses
• Subscripts and superscripts