Curly braces in math mode - TeX - LaTeX Stack Exchange
How do I get curly braces to show in math mode? When I write this: $ K_1 = {s_1}, K_2 = {s_2, s_3, s_4} $ the braces disappear in the output.
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What is the difference between curly braces, parentheses, and square brackets in math mode in LaTeX? - Quora
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