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I came across this symbol that looks like an epsilon and \in symbol. Can someone tell me what it is? I dont know how to make TeX display on this page (unlike MathSE).

eee

J. Doe
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    It is an epsilon, see https://tex.stackexchange.com/questions/98013/varepsilon-vs-epsilon. – Marijn Jan 19 '20 at 10:44
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    This is the lunate (or uncial) epsilon and it is obtained with the \epsilon command (in math mode). The usual ε is obtained with the \varepsilon command. – Bernard Jan 19 '20 at 10:45
  • When I copy from that PDF, I got this symbol: ǫ. Why does it happen? – J. Doe Jan 19 '20 at 10:50
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    tex math fonts use custom font encodings with only 127 characters in each font, placed essentially arbitrarily in different fonts, in the ascii letter positions, so tex knows that \epsilon selects a particular slot in a particular font, but if you take plain text from the pdf, all you have is a numeric number which is then interpreted as a Unicode position so you get a more or less random letter. – David Carlisle Jan 19 '20 at 10:58
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    if you want fonts with Unicode values in the output, use lualatex or xelatex and the unicode-math package. – David Carlisle Jan 19 '20 at 10:59
  • Thank you, David! Your expert knowledge always enlighten me. – J. Doe Jan 19 '20 at 11:32
  • It does help. The reason why I posted this question is because I am unsure of the expected answer. I know epsilon but was unsure if the guess was right. – J. Doe Jan 19 '20 at 13:07

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enter image description here

Simply walk across to Detexify -- http://detexify.kirelabs.org/classify.html -- for identifying a symbol

Also see -- How to look up a symbol or identify a math symbol or character?

js bibra
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