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How can I use a binary operator (like union or otimes) as a large operator (such as int or sum)?

You have to define the symbol you want to use as a user-defined symbol first. See FAQ #012 for instructions; most of the symbols used by Math are part of the StarMath font.

Let's say you have defined the union symbol as the user-defined symbol %union. You can then enter, for example:

oper%union from i in I A_i

to typeset the formula as shown in the following image.

image of resulting formula

Any user-defined symbol can be used as a large operator, if it is preceded with oper as shown in the example.

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