@luciaceeThe longest equation in physics is a staggering beast, as seen in this handwritten page of the Standard Model Lagrangian.
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Longest equation in physics Standard Model Lagrangian
Photo by @luciacee· Jun 15, 2026· Science
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A dense page of handwritten equations fills the frame, black ink on white paper. The top line is labeled "CSM =" followed by a long string of mathematical expressions with superscripts, subscripts, Greek letters, and multiple integral-like terms. The writing is compact, with equations stacked vertically and minimal spacing between lines. No diagrams or additional text appear beyond the formulas themselves.
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