In mathematics, an exact category is a concept of category theory due to Daniel Quillen which is designed to encapsulate the properties of short exact sequences in abelian categories without requiring that morphisms actually possess kernels and cokernels, which is necessary for the usual definition of such a sequence.
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“In the long-run every Government is the exact symbol of its People, with their wisdom and unwisdom; we have to say, Like People like Government.”
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