List of Greek letters and math symbols - Overleaf, Online LaTeX Editor
TeX and Typography on Twitter: "Four lower case Greek letters have "var" forms in TeX. Top row basic letter, bottom row var form. \epsilon on top, \varepsilon on bottom, etc. https://t.co/syg3PAataU" /
Greek Alphabet in Latex | PDF
LaTeX: Default font(s) for greek letters? - Stack Overflow
Solomon Kurz on Twitter: "In LaTeX, we have \varepsilon and \epsilon. Does it matter at all which one one uses? https://t.co/wVeIo87hs0" / Twitter
LaTeX Math Symbols
What is epsilon 0? - Quora
Tricks of Latex | Yekun's ML Notes
LaTeX Symbol Cheat Sheet
Big Phi(Φ) symbol in LaTeX | Latexhelp
pdftex - Bold \varepsilon not as bold as it should be! - TeX - LaTeX Stack Exchange