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Possible Answers: STE, EXT.
Random information on the term “STE”:
Established in 1908, the Stockton Terminal and Eastern Railroad (reporting mark STE) provides service to several companies around the Stockton area, in San Joaquin County, California.
It is a former Southern Pacific Transportation Company line. OmniTRAX acquired the ST&E in 2011.
The railroad operates 25 miles of track connecting with the BNSF Railway, the Union Pacific Railroad, and the Central California Traction Company (CTT).
Being located in Stockton places the STE in a good situation for the consolidation and distribution of freight for companies in the region. The companies include PDM Steel, Lipton, and the Salt River Materials Group. The Port of Stockton is served by the connecting Central California Traction Company (CTT)
The Stockton Terminal and Eastern locomotive No. 1 is on display at the Travel Town Museum in Griffith Park, located in Los Angeles, California.
Random information on the term “EXT”:
In mathematics, the Ext functors of homological algebra are derived functors of Hom functors. They were first used in algebraic topology, but are common in many areas of mathematics. The name “Ext” comes from group theory, as the Ext functor is used in group cohomology to classify abelian group extensions.
Let R be a ring and let ModR be the category of modules over R. Let B be in ModR and set T(B) = HomR(A,B), for fixed A in ModR. This is a left exact functor and thus has right derived functors RnT. The Ext functor is defined by
This can be calculated by taking any injective resolution
Then (RnT)(B) is the homology of this complex. Note that HomR(A,B) is excluded from the complex.
An alternative definition is given using the functor G(A)=HomR(A,B). For a fixed module B, this is a contravariant left exact functor, and thus we also have right derived functors RnG, and can define
This can be calculated by choosing any projective resolution