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PlanetPhysics/Essential Subcategory

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A category ${\mathcal {B}}_{E}$ is defined as an essential subcategory of category ${\mathcal {A}}$ if every object of ${\mathcal {A}}$ is isomorphic to some object of ${\mathcal {B}}_{E}$ .

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References

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↑ Paul Taylor. "Practical Foundations of Mathematics.", Cambridge University Press, 1999. (see also categories, functors and pseudo-functors).

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PlanetPhysics