Talk:Homotopy category of chain complexes
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[edit] Notation
What does the double arrow mean in the chain homotopy diagram. Thanks! Randomblue (talk) 18:38, 27 August 2008 (UTC)
- It means that there are two maps: see the letters next to each arrow? This diagram does not entirely follow the usual conventions for commutative diagrams, as you can see from the formula above it. Ryan Reich (talk) 02:27, 28 August 2008 (UTC)
