Example 6.3.34. For the derived category \(\D (\Aa )\) of an abelian category, the subcategory \(\D (\Aa )^{\flat }\) is often denoted \(\D ^b(\Aa )\) and called the bounded derived category. Similarly, \(\D (\Aa )^-\) is denoted \(\D ^-(\Aa )\) and \(\D (\Aa )^+\) is denoted \(\D ^+(\Aa )\).
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