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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When I enter equations in LaTeX with '$$' or 'egin {align}', why does it add a gigantic newline in front of it, and how do I stop it? - Quora