| 11. | A non-abelian, whereas the electric charge is abelian.
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| 12. | A non-abelian, whereas the electric charge is abelian.
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| 13. | Sheaves of modules over a ringed space form an abelian category.
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| 14. | Quantum electrodynamics is the most famous example an Abelian gauge theory.
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| 15. | Let f be a morphism in a quasi-abelian category.
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| 16. | The functor which maps a ring to its underlying additive abelian group.
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| 17. | Extensions whose Galois group is abelian are called abelian extensions.
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| 18. | Extensions whose Galois group is abelian are called abelian extensions.
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| 19. | This follows from the classification of finitely generated abelian groups.
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| 20. | The first two properties make a bilinear map of the abelian group.
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