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When (mod ) an extended quadratic residue code is self-dual; otherwise it is equivalent but not equal to its dual. By the Gleason–Prange theorem (named for Andrew Gleason and Eugene Prange ), the automorphism group of an extended quadratic residue code has a subgroup which is isomorphic to either P S L 2 ( p ) {\displaystyle PSL_{2}(p)} or S ...
Let / be a field extension.An element is a primitive element for / if = (), i.e. if every element of can be written as a rational function in with coefficients in .If there exists such a primitive element, then / is referred to as a simple extension.
Quantum ESPRESSO (Quantum Open-Source Package for Research in Electronic Structure, Simulation, and Optimization; QE) [2] [3] is a suite for first-principles electronic-structure calculations and materials modeling, distributed for free and as free software under the GNU General Public License.
If E is a radical extension of F and F is a radical extension of K then E is a radical extension of K. If E and F are radical extensions of K in an extension field C of K, then the compositum EF (the smallest subfield of C that contains both E and F) is a radical extension of K. If E is a radical extension of F and E > K > F then E is a radical ...
A field extension L/K is called a simple extension if there exists an element θ in L with L = K ( θ ) . {\displaystyle L=K(\theta ).} This means that every element of L can be expressed as a rational fraction in θ , with coefficients in K ; that is, it is produced from θ and elements of K by the field operations +, −, •, / .
In field theory, a primitive element of a finite field GF(q) is a generator of the multiplicative group of the field. In other words, α ∈ GF(q) is called a primitive element if it is a primitive (q − 1) th root of unity in GF(q); this means that each non-zero element of GF(q) can be written as α i for some natural number i.
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