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For example, if I wanted to know what the product/coproduct is in a certain category, I could find it on that site. I commonly come across websites (such as wikipedia) that give a few examples of some categorical concept. I would like a site with a large database which is constantly updated.

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This topic was discussed on the nForum a few weeks ago. –  Zhen Lin Jul 28 '12 at 5:06

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