To write the union symbol in LaTeX, use the cup command. For example: $$A cup B$$ A ∪ B This represents the union of sets A and B.

This new set is denoted by A ∪ B, and the symbol used for it can be produced with the command cup inside math mode. Using set notation, the rigorous definition of the union of sets is: A ∪ B = {x ∣ x ∈ A or x ∈ B} A ∪ B = { x ∣ x ∈ A or x ∈ B } This output was produced by the code: % Union symbol in LaTeX [