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.

Getting Started with Math

Moodle in English: Formulas question type fro Moodle 2.0

Moodle in English: Formulas question type fro Moodle 2.0

math mode - Professional curly braces in MTPro2 font - TeX - LaTeX Stack Exchange

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LaTeX and Overleaf

latexdiff/latexdiff at master · ftilmann/latexdiff · GitHub

Org ad hoc code, quick hacks and workarounds

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Guide for LaTeX users – Typst Documentation