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2. Wedding ring - Wikipedia

   en.wikipedia.org/wiki/Wedding_ring

   Wedding ring. A wedding ring is commonly worn on the ring finger. A pair of wedding rings. A wedding ring or wedding band is a finger ring that indicates that its wearer is married. [ 1] It is usually forged from metal, traditionally gold or another precious metal. Rings were used in ancient Rome during marriage.

3. List of unusual deaths - Wikipedia

   en.wikipedia.org/wiki/List_of_unusual_deaths

   The death of Aeschylus, killed by a turtle dropped onto his head by a falcon, illustrated in the 15th-century Florentine Picture-Chronicle by Baccio Baldini [1]. This list of unusual deaths includes unique or extremely rare circumstances of death recorded throughout history, noted as being unusual by multiple sources.

4. Unique factorization domain - Wikipedia

   en.wikipedia.org/wiki/Unique_factorization_domain

   Formally, a unique factorization domain is defined to be an integral domain R in which every non-zero element x of R can be written as a product of a unit u and zero or more irreducible elements pi of R : x = u p1 p2 ⋅⋅⋅ pn with n ≥ 0. and this representation is unique in the following sense: If q1, ..., qm are irreducible elements of R ...

5. Ring (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Ring_(mathematics)

   For any ring R, there are a unique ring homomorphism ⁠ ⁠ and a unique ring homomorphism R → 0. An epimorphism (that is, right-cancelable morphism) of rings need not be surjective. For example, the unique map ⁠ ⁠ is an epimorphism.

6. Ring homomorphism - Wikipedia

   en.wikipedia.org/wiki/Ring_homomorphism

   For every ring R, there is a unique ring homomorphism Z → R. This says that the ring of integers is an initial object in the category of rings. For every ring R, there is a unique ring homomorphism from R to the zero ring. This says that the zero ring is a terminal object in the category of rings.

7. Power ring (DC Comics) - Wikipedia

   en.wikipedia.org/wiki/Power_ring_(DC_Comics)

   The first appearance of a power ring was in All-American Comics #16 on July 14, 1940, the flagship title of comic book publisher All-American Publications, which featured the first appearance of Alan Scott. Creator Martin Nodell has cited Richard Wagner 's opera cycle The Ring of the Nibelung and the sight of a trainman's green railway lantern ...