Greek letters in LaTeX (α, β, γ … Ω) in LaTeX

Lowercase Greek letters are the backslash plus the letter's name; capitals are the same with a capital first letter. Letters whose capital looks like a Latin letter (Alpha, Beta, Epsilon …) have no capital command because you just type A, B, E. The \var forms are alternative glyphs, and \varepsilon and \varphi are the ones most people actually want.

All ways to write it

Command	Use	Package
`\alpha`	α	none
`\beta`	β	none
`\gamma \Gamma`	γ Γ	none
`\delta \Delta`	δ Δ	none
`\epsilon \varepsilon`	ϵ ε	none
`\zeta`	ζ	none
`\eta`	η	none
`\theta \vartheta \Theta`	θ ϑ Θ	none
`\iota`	ι	none
`\kappa`	κ	none
`\lambda \Lambda`	λ Λ	none
`\mu`	μ	none
`\nu`	ν	none
`\xi \Xi`	ξ Ξ	none
`\pi \varpi \Pi`	π ϖ Π	none
`\rho \varrho`	ρ ϱ	none
`\sigma \varsigma \Sigma`	σ ς Σ	none
`\tau`	τ	none
`\upsilon \Upsilon`	υ Υ	none
`\phi \varphi \Phi`	ϕ φ Φ	none
`\chi`	χ	none
`\psi \Psi`	ψ Ψ	none
`\omega \Omega`	ω Ω	none

Example

e^{i\pi} + 1 = 0, \qquad \Gamma(n) = (n-1)!, \qquad \sigma^2 = \frac{1}{N}\sum (x_i - \mu)^2

Euler's identity, the gamma function and a population variance.

Questions

Why is there no \Alpha?

Capital alpha is identical to a Latin A, so LaTeX leaves it out. The same goes for B, E, Z, H, I, K, M, N, O, P, T, X.

How do I get upright (non-italic) Greek?

The upgreek package provides \upalpha and friends in LaTeX. KaTeX has no upright Greek; \mathrm{\alpha} does nothing.

Related symbols

Delta Δ \delta
Summation ∑ \sum_{i=1}^{n}
Product ∏ \prod_{i=1}^{n}
Laplacian ∆ \Delta

Using greek letters in Confluence

Confluence Cloud has no built-in LaTeX. With LaTeX Math for Confluence you add a math macro to any page, type \alpha and it renders inline or as a block, with a live preview while you edit. Every command on this page renders there without extra packages.