Some uppercase greek symbols are not recognized

[murpholinox]

For example this

\[
 \Epsilon \epsilon \Alpha \alpha \Beta \beta \Gamma \gamma \Omega \omega
\]

gives

[lierdakil]

LaTeX doesn't define all of the uppercase Greek letters, because those would look exactly like Latin:

For reference,

No special math mode symbols:

• o ⇒ O

Only lowercase mathmode symbols:

• α \alpha ⇒ A
• β \beta ⇒ B
• ε \epsilon ⇒ E
• ζ \zeta ⇒ Z
• η \eta ⇒ H
• ι \iota ⇒ I
• κ \kappa ⇒ K
• μ \mu ⇒ M
• ν \nu ⇒ N
• ρ \rho ⇒ P
• τ \tau ⇒ T
• χ \chi ⇒ X

Lowercase and uppercase mathmode symbols:

• γ \gamma ⇒ Γ \Gamma
• δ \delta ⇒ Δ \Delta
• θ \theta ⇒ Θ \Theta
• λ \lambda ⇒ Λ \Lambda
• ξ \xi ⇒ Ξ \Xi
• π \pi ⇒ Π \Pi
• σ \sigma ⇒ Σ \Sigma
• υ \upsilon ⇒ Υ \Upsilon (depending on the font, it's less like Y, e.g. )
• φ \phi ⇒ Φ \Phi
• ψ \psi ⇒ Ψ \Psi
• ω \omega ⇒ Ω \Omega

Define the commands yourself if you need to:

\newcommand\Alpha{\mathrm{A}}
\newcommand\Beta{\mathrm{B}}
\newcommand\Epsilon{\mathrm{E}}
\newcommand\Zeta{\mathrm{Z}}
\newcommand\Eta{\mathrm{H}}
\newcommand\Iota{\mathrm{I}}
\newcommand\Kappa{\mathrm{K}}
\newcommand\Mu{\mathrm{M}}
\newcommand\Nu{\mathrm{N}}
\newcommand\Rho{\mathrm{P}}
\newcommand\Tau{\mathrm{T}}
\newcommand\Chi{\mathrm{X}}

See docs on global macro definitions

Alpha: "\\mathrm{A}"
Beta: "\\mathrm{B}"
Epsilon: "\\mathrm{E}"
Zeta: "\\mathrm{Z}"
Eta: "\\mathrm{H}"
Iota: "\\mathrm{I}"
Kappa: "\\mathrm{K}"
Mu: "\\mathrm{M}"
Nu: "\\mathrm{N}"
Rho: "\\mathrm{P}"
Tau: "\\mathrm{T}"
Chi: "\\mathrm{X}"

[murpholinox]

You are right! I am so dumb!
As an excuse I can say that I have not slept much

[lierdakil]

Happens to all of us. No harm done.