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Sigma AB information


Sigma AB
Company typePrivate
IndustryConsulting services for IT, Energy, Industry and Infrastructure projects
Founded1986; 38 years ago (1986)
FounderDan Olofsson (Chairman)
HeadquartersMalmö, Sweden
OwnerDanir AB
Number of employees
5000 (August 2022)
Websitewww.sigma.se

Sigma AB (or Sigma Group) is a group of companies carrying out consultancy operations within IT, information logistics, engineering services, technical R&D, industry and social structure.

Sigma AB offers its services through the business areas Sigma Technology, Sigma Connectivity, Sigma Industry, Sigma Civil and Sigma Software, within which Sigma AB provides group management and manages the overall Sigma brand. It was listed on Stockholm Stock Exchange Small Cap list and NASDAQ OMX until 2013.

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Sigma AB

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structure. Sigma AB offers its services through the business areas Sigma Technology, Sigma Connectivity, Sigma Industry, Sigma Civil and Sigma Software...

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Propagation of uncertainty

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{\displaystyle \sigma _{A},\sigma _{B},} covariance σ A B = ρ A B σ A σ B , {\displaystyle \sigma _{AB}=\rho _{AB}\sigma _{A}\sigma _{B},} and correlation...

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Collision theory

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is: Z = n A n B σ AB 8 k B T π μ AB = 10 6 N A 2 [A][B] σ AB 8 k B T π μ AB {\displaystyle Z=n_{\text{A}}n_{\text{B}}\sigma _{\text{AB}}{\sqrt {\frac {8k_{\text{B}}T}{\pi...

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Optical scalars

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(6)\quad B_{ab}={\frac {1}{3}}\theta h_{ab}+\sigma _{ab}+\omega _{ab}\;,\quad \theta =g^{ab}\theta _{ab}=g^{ab}B_{(ab)}\;,\quad \sigma _{ab}=\theta _{ab}-{\frac...

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Spin connection

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_{\mu }^{\ ab}=e_{\nu }^{\ a}\Gamma _{\ \sigma \mu }^{\nu }e^{\sigma b}+e_{\nu }^{\ a}\partial _{\mu }e^{\nu b}=e_{\nu }^{\ a}\Gamma _{\ \sigma \mu }^{\nu...

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Entanglement of formation

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\rho _{AB},\sigma _{AB}} such that the entanglement of formation of the joint state ρ A B ⊗ σ A B {\displaystyle \rho _{AB}\otimes \sigma _{AB}} is smaller...

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Polyakov action

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{T}{2}}\int \mathrm {d} ^{2}\sigma \,{\sqrt {-h}}\,h^{ab}g_{\mu \nu }(X)\partial _{a}X^{\mu }(\sigma )\partial _{b}X^{\nu }(\sigma ),} where T {\displaystyle...

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Raychaudhuri equation

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{\displaystyle \sigma _{ab}=\theta _{ab}-{\frac {1}{3}}\,\theta \,h_{ab}} and the vorticity tensor ω a b = h m a h n b X [ m ; n ] {\displaystyle \omega _{ab}={h^{m}}_{a}\...

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Singular value

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_{i=n}^{i=n-k+1}\sigma _{i}(A)\sigma _{i}(B)&\leq \prod _{i=n}^{i=n-k+1}\sigma _{i}(AB)\\\prod _{i=1}^{k}\sigma _{i}(AB)&\leq \prod _{i=1}^{k}\sigma _{i}(A)\sigma _{i}(B)...

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Vector algebra relations

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A and B containing the angle θ is: Σ = A B sin ⁡ θ , {\displaystyle \Sigma =AB\sin \theta ,} which will be recognized as the magnitude of the vector...

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Collision frequency

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N A N B σ AB 8 k B T π μ AB , {\displaystyle Z=N_{\text{A}}N_{\text{B}}\sigma _{\text{AB}}{\sqrt {\frac {8k_{\text{B}}T}{\pi \mu _{\text{AB}}}}},} which...

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Sigma Scorpii

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third component (designated Sigma Scorpii Ab) at 0.4 arcseconds from the spectroscopic pair, and a fourth component (Sigma Scorpii B) at about 20 arcseconds...

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Algebraic Eraser

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a b ) = ( m A P u b B , σ b ) ∗ B a {\displaystyle (S_{ab},\sigma _{ab})=(m_{A}Pub_{B},\sigma _{b})*\mathrm {B} _{a}} and Bob computes ( S b a , σ b a...

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Ferrimagnetism

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{H}}_{a}={\vec {H}}_{0}+Ng\mu _{B}S_{a}\gamma _{ab}(\lambda \alpha {\vec {\sigma }}_{a}-\mu {\vec {\sigma }}_{b}),} H → b = H → 0 + N g μ B S b γ a b (...

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Normal distribution

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2 2 σ 2 {\displaystyle f(x)={\frac {1}{\sqrt {2\pi \sigma ^{2}}}}e^{-{\frac {(x-\mu )^{2}}{2\sigma ^{2}}}}} The parameter μ {\displaystyle \mu } is the...

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Bengt Holgersson

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corruption regarding a trip to South Africa which they had accepted from Sigma AB. In the end Both Holgersson and Reepalu were acquitted. In 2006 he was...

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Harman Connected Services

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included Nokia, Motorola and SonyEricsson. In early 2000, it was acquired by Sigma AB, a leading Swedish engineering services business, and became its UK subsidiary...

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Pauli matrices

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sigma _{j},\sigma _{k}\right]+\{\sigma _{j},\sigma _{k}\}&=(\sigma _{j}\sigma _{k}-\sigma _{k}\sigma _{j})+(\sigma _{j}\sigma _{k}+\sigma _{k}\sigma...

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Mathematics of general relativity

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\nabla _{\sigma }[V_{\mu \nu }]=\partial _{\sigma }V_{\mu \nu }-\Gamma ^{\rho }{}_{\mu \sigma }V_{\rho \nu }-\Gamma ^{\rho }{}_{\nu \sigma }V_{\mu \rho...

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Multiplicative function

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+ 3 1 + 9 1 ) = 31 ⋅ 13 = 403 {\displaystyle \sigma (144)=\sigma _{1}(144)=\sigma _{1}(2^{4})\,\sigma _{1}(3^{2})=(1^{1}+2^{1}+4^{1}+8^{1}+16^{1})(1...

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