\dots are not rendered consistently within <math><\math> in wikipedia.org. e.g. in
U 1 , U 2 , ⋯ ∈ A {\displaystyle {\mathcal {U}}_{1},{\mathcal {U}}_{2},\dots \in {\mathcal {A}}}
the dots are rendered to the bottom of line as required. But in
U 1 , U 2 , … {\displaystyle {\mathcal {U}}_{1},{\mathcal {U}}_{2},\dots }
The dots are rendered as in \cdots