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Greek : greek capital letter delta
arXiv:2203.12629v1 [hep-th] 23 Mar 2022
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symbols - How to insert a triangle/rectangle with plus sign in it (abstract algebra operators)? - TeX - LaTeX Stack Exchange
LaTeX Math Symbols
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Anticomplementary Triangle -- from Wolfram MathWorld
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LaTeX Math Symbols
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Latex Math Symbols
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Symbol Table | PDF
