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The following equivalent definitions of a left perfect ring R are found in Anderson and Fuller: [2]. Every left R-module has a projective cover.; R/J(R) is semisimple and J(R) is left T-nilpotent (that is, for every infinite sequence of elements of J(R) there is an n such that the product of first n terms are zero), where J(R) is the Jacobson radical of R.
Let C be an additive category, or more generally an additive R-linear category for a commutative ring R. We call C a Krull–Schmidt category provided that every object decomposes into a finite direct sum of objects having local endomorphism rings. Equivalently, C has split idempotents and the endomorphism ring of every object is semiperfect.
Gilbert cloud chamber, assembled An alternative view of kit contents. The lab contained a cloud chamber allowing the viewer to watch alpha particles traveling at 12,000 miles per second (19,000,000 m/s), a spinthariscope showing the results of radioactive disintegration on a fluorescent screen, and an electroscope measuring the radioactivity of different substances in the set.
DIY was originally founded by Vimeo co-founder Zach Klein, [2] Isaiah Saxon, Andrew Sliwinski, and Daren Rabinovitch in May 2012. [3] [4] The company launched a second online children's educational platform in 2016 called JAM.com, [5] [6] which was subscription-based and more focused on a course structure for learning versus DIY's free and badge-based skill building structure.
A secret decoder ring (or secret decoder) is a device that allows one to decode a simple substitution cipher—or to encrypt a message by working in the opposite direction. [ 1 ] As inexpensive toys, secret decoders have often been used as promotional items by retailers, as well as radio and television programs, from the 1930s through to the ...
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The show Grey's Anatomy is mocked in "The Ring"; Kenny and Tammy, and the other characters who wear purity rings, develop a strong affinity for the show as they become more boring. (Incidentally several actors and actresses connected to Disney have appeared in the Disney-produced Grey's Anatomy , broadcast on a Disney-owned network .)
The episode opens with Stan, Kyle, Cartman, and a disembodied Kenny (sharing Cartman's body) playing "The Lord of the Rings." Stan's parents have rented the movie The Lord of the Rings (specifically, The Fellowship of the Ring), and tell Stan, Kyle & Cartman to bring it to Butters' parents, as they had asked to borrow it. Still caught up in ...