Specific Categories
- Category of sets –
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- Concrete category –
- Category of vector spaces –
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- Category of graded vector spaces –
- Category of chain complexes –
- Category of finite dimensional Hilbert spaces –
- Category of sets and relations –
- Category of topological spaces –
- Category of metric spaces –
- Category of preordered sets –
- Category of groups –
- Category of abelian groups –
- Category of rings –
- Category of magmas –
- Category of medial magmas –
Read more about this topic: Outline Of Category Theory
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“Patriotism is proud of a country’s virtues and eager to correct its deficiencies; it also acknowledges the legitimate patriotism of other countries, with their own specific virtues. The pride of nationalism, however, trumpets its country’s virtues and denies its deficiencies, while it is contemptuous toward the virtues of other countries. It wants to be, and proclaims itself to be, “the greatest,” but greatness is not required of a country; only goodness is.”
—Sydney J. Harris (1917–1986)
“all the categories which we employ to describe conscious mental acts, such as ideas, purposes, resolutions, and so on, can be applied to ... these latent states.”
—Sigmund Freud (1856–1939)