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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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you'd probably get better answers if you ask over at – Willie Wong Nov 7 '10 at 12:27
The Wikipedia article uses \bigvee. – Qiaochu Yuan Nov 7 '10 at 12:50
I posted also in tex.stackexchange... Sorry for the bad question. Bigvee is already assigned to the wedge sum, very different from connected sum (I made a mistake in writing before) – Fosco Loregian Nov 7 '10 at 12:55
Why not just do `$\#_{i=1}^n X_i$'? – Grumpy Parsnip Nov 7 '10 at 13:18
P.S. $\#$ is an operation on manifolds, not arbitrary topological spaces. – Grumpy Parsnip Nov 7 '10 at 14:00

This question was asked over at, 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.

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