in a sigma bond. Transition metal silane complexes are often especially stable sigma complexes. A particularly common subset of sigma complexes are those...

Sigma (/ˈsɪɡmə/ SIG-mə; uppercase Σ, lowercase σ, lowercase in word-final position ς; Ancient Greek: σίγμα) is the eighteenth letter of the Greek alphabet...

is a special case of a C–H sigma complex. Historically, agostic complexes were the first examples of C–H sigma complexes to be observed spectroscopically...

sigma factor with a molecular weight of 70 kDa. The sigma factor in the RNA polymerase holoenzyme complex is required for the initiation of transcription...

set of three 2 × 2 complex matrices that are traceless, Hermitian, involutory and unitary. Usually indicated by the Greek letter sigma (σ), they are occasionally...

this complex is also called a Wheland intermediate, after American chemist George Willard Wheland (1907–1976). They are also called sigma complexes. The...

silyl complexes describe coordination complexes in which a transition metal is bonded to an anionic silyl ligand, forming a metal-silicon sigma bond....

Dihydrogen complexes are coordination complexes containing intact H2 as a ligand. They are a subset of sigma complexes. The prototypical complex is W(CO)3(PCy3)2(H2)...

Delta-sigma (ΔΣ; or sigma-delta, ΣΔ) modulation is an oversampling method for encoding signals into low bit depth digital signals at a very high sample-frequency...

In chemistry, sigma bonds (σ bonds) or sigma overlap are the strongest type of covalent chemical bond. They are formed by head-on overlapping between atomic...

Six Sigma (6σ) is a set of techniques and tools for process improvement. It was introduced by American engineer Bill Smith while working at Motorola in...

three-centered σ complex is invoked, followed by intramolecular ligand bond cleavage of the ligand (probably by donation of electron pair into the sigma* orbital...

\sigma _{1}\sigma _{2}} , ( σ 1 2 = σ 2 2 = 1 , σ 1 σ 2 + σ 2 σ 1 = 0 {\displaystyle \sigma _{1}^{2}=\sigma _{2}^{2}=1,\sigma _{1}\sigma _{2}+\sigma _{2}\sigma...

{i} &=-\sigma _{2}\sigma _{3}=-i\sigma _{1}\\\mathbf {j} &=-\sigma _{3}\sigma _{1}=-i\sigma _{2}\\\mathbf {k} &=-\sigma _{1}\sigma _{2}=-i\sigma _{3}\end{aligned}}}...

In mathematical analysis and in probability theory, a σ-algebra ("sigma algebra") is part of the formalism for defining sets that can be measured. In...

m\times n} complex matrix ⁠ M {\displaystyle \mathbf {M} } ⁠ is a factorization of the form M = U Σ V ∗ , {\displaystyle \mathbf {M} =\mathbf {U\Sigma V^{*}}...

complex that contains a hydride, a silyl ligand (R3Si), and the alkene substrate. Oxidative addition proceeds by the intermediacy of a sigma-complex,...

Design for Six Sigma (DFSS) is a collection of best-practices for the development of new products and processes. It is sometimes deployed as an engineering...

, {\displaystyle f(x;\sigma )={\frac {x}{\sigma ^{2}}}e^{-x^{2}/(2\sigma ^{2})},\quad x\geq 0,} where σ {\displaystyle \sigma } is the scale parameter...

_{1})(X_{2}-\mu _{2})]}{\sigma (X_{1})\sigma (X_{2})}}&\cdots &{\frac {\operatorname {E} [(X_{1}-\mu _{1})(X_{n}-\mu _{n})]}{\sigma (X_{1})\sigma (X_{n})}}\\\\{\frac...

-i\sigma _{1}=-\sigma _{2}\sigma _{3},\quad \mathbf {j} \mapsto -i\sigma _{2}=-\sigma _{3}\sigma _{1},\quad \mathbf {k} \mapsto -i\sigma _{3}=-\sigma _{1}\sigma...

{\displaystyle \sigma \in {\mathcal {K}}} of dimension exactly k. Informally, a pure 1-complex "looks" like it's made of a bunch of lines, a 2-complex "looks"...

− P ( ∂ σ ) . {\displaystyle \partial P(\sigma )=f_{\sharp }(\sigma )-g_{\sharp }(\sigma )-P(\partial \sigma ).} So if α in Cn(X) is an n-cycle, then...

{\displaystyle \sigma [0]<\sigma [1]<\cdots <\sigma [n]} in the complex's vertex ordering, where σ [ i ] {\displaystyle \sigma [i]} is the i {\displaystyle...

to simply equate the two sigma codes for operations which are concerned with word content, for example. Examples of complex rendering — SIL international's...

parameter σ 2 {\textstyle \sigma ^{2}} is the variance. The standard deviation of the distribution is ⁠ σ {\displaystyle \sigma } ⁠ (sigma). A random variable...

Sigma non-innocence is a special form of non-innocence, an oxidation characteristic in metal complexes. It is mainly discussed in coordination complexes...

}(X)} . Then, for each σ ⊂ X {\displaystyle \sigma \subset X} , let σ ∈ C ˇ ε ( X ) {\displaystyle \sigma \in {\check {C}}_{\varepsilon }(X)} if the set...

\operatorname {Lk} (\sigma ,X):=\{\tau \in X:~\tau \cap \sigma =\emptyset ,~\tau \cup \sigma \in X\}} . Given a geometric simplicial complex X and any face...

{\displaystyle \sigma (T)\cap \mathbb {R} =\sigma _{\mathbb {R} }(T)} . Note that the real spectrum may or may not coincide with the complex spectrum. In...