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Jan 11, 2010 at 18:52 comment added Vipul Naik Thanks! I had naively assumed that the map to the coproduct is always monic and the map from the product is always epic -- but the examples involving zero objects show that this is not the case.
Jan 11, 2010 at 18:40 vote accept Vipul Naik
Jan 11, 2010 at 18:15 history answered Clark Barwick CC BY-SA 2.5