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It's Unicode symbol U+22F9 "Element of with two horizontal strokes": ⋹. When LuaTeX or XeTeX is used, then the symbol is available with the following fonts: Asana Math \documentclass{article} \usepackage{unicode-math} \setmathfont{Asana-Math.otf} \begin{document} \[ A \isinE B \] \end{document} XITS Math \setmathfont{xits-math.otf} The ...


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This uses a stack, and will work in all mathstyles. \documentclass{article} \usepackage{graphicx,stackengine,scalerel} \usepackage{amsmath} \newcommand\Inn{\def\stackalignment{c}\def\stacktype{L}\ThisStyle{\mathrel{% \stackon[0pt]{$\SavedStyle\subset$}{\scalebox{0.86}[1]{$\SavedStyle=$}}}}% } \begin{document} \[ A\in B \] \[ A\Inn B\quad \scriptstyle ...


13

Here's one option using \ooalign: \documentclass{article} \usepackage{graphicx} \usepackage{amsmath} \newcommand\Inn{% \mathrel{\ooalign{$\subset$\cr\hfil\scalebox{0.8}[1]{$=$}\hfil\cr}}% } \begin{document} \[ A\in B \] \[ A\Inn B \] \end{document} The result: And if you need it for the different math styles: \documentclass{article} ...



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