greek letters

• How to Write Alternate Greek Symbols in LaTeX
  LaTeX has built-in math commands for alternate Greek letters such as \varepsilon, \vartheta, \varphi, and three other common variants.
• How to Convert UTF-8 Greek Letters to LaTeX Symbols
  Map UTF-8 Greek characters such as α and Ω to LaTeX math commands, handle variant forms, and choose a safe workflow for pdfLaTeX or Unicode engines.