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How can I render the connected sum of $n$ topological spaces (or other quite strange topological operations) in a "product-like" manner? What I'm looking for is writing, for example $ {\Large{*}}_{i=1}^n G_i $ for the free product of n groups. How can I render this with the # operation in topological spaces? (Yes, I'm studying Hatcher's AT...)

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    P.S. $\#$ is an operation on manifolds, not arbitrary topological spaces.2010-11-07

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This question was asked over at tex.se, Define strange operators, with an accepted answer by frabjous:

The \mathop{..} command from amsmath makes its argument behave like a "large operator".

with some example code.