# Class

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In set theory, a class refers to a set made up of other sets. For example, if $A=\{a,b,c\}$ is a set, then \$\mathscr{A}=\{\{a\},\{b\},\{b,c\}\}\$ (Error compiling LaTeX. ! Undefined control sequence.) is a class made up of some of the subsets of $A$.