1-minute answer
LaTeX represents math symbols with backslash commands inside math mode ($...$) — for example \sum for ∑ and \alpha for α.
01 Step by step, per platform
A real, followable procedure for every platform — not a thin restatement of the shortcut.
Common commands
- \pm → ±, \times → ×, \div → ÷.
- \leq / \geq → ≤ / ≥, \neq → ≠.
- \sum → ∑, \int → ∫, \infty → ∞.
- Greek letters: \alpha \beta \gamma \pi \theta \omega, etc — lowercase command gives lowercase letter, capitalized command (\Omega) gives the capital.
Using them
- Must be inside math mode: $\sum_{i=1}^{n} x_i$.
- Outside math mode, these commands either error or do nothing.
02 FAQ
Can I just paste the Unicode character (∑) instead of \sum?
In modern LaTeX with the unicode-math package, yes. In classic LaTeX, no — stick to the backslash commands for portability.
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