𝜎-ideal, or sigma ideal, of a σ-algebra (𝜎, read "sigma") is a subset with certain desirable closure properties. It is a special type of ideal. Its...

also need this ideal to be a sigma-ideal, so that countable unions of negligible sets are also negligible. If I and J are both ideals of subsets of the...

Bateman from the 2000 film American Psycho is often cited as an ideal representation of a "sigma male", both through memes and unironic discussion. Beth Skwarecki...

cultivate and maintain the high ideals of friendship, justice, and learning upon which Sigma Chi was founded." Sigma Chi was founded in 1855 by Benjamin...

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...

selected based on their representation of the ideals of Beta Sigma Phi. The Torch is the magazine of Beta Sigma Phi, publishing stories and poems by members...

keeping with the ideal of democracy which had always been part of the fraternity's creed. Thus, responsive to this thinking, Sigma Alpha Mu at its 1953...

associations in the United States and Canada. Phi Sigma Sigma was founded to establish the twin ideals of promoting the brotherhood of man and alleviation...

\sigma } has a number density n σ {\displaystyle n_{\sigma }} , mass m σ {\displaystyle m_{\sigma }} , electric charge q σ {\displaystyle q_{\sigma }}...

{\displaystyle \sigma } -ideal, but the converse is not true in general. The intersection of an arbitrary family of bands is again a band. As with ideals, for every...

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

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...

{\displaystyle \Sigma ,} the union J = ⋃ i ≥ 1 J i {\textstyle J=\bigcup _{i\geq 1}J_{i}} is an ideal that belongs to Σ , {\displaystyle \Sigma ,} since otherwise...

from sets to numbers σ-algebra – Algebraic structure of set algebra Sigma-ideal – Family closed under subsets and countable unions 𝜎-ring – Family of...

Phi Beta Sigma Fraternity, Inc. (ΦΒΣ) is a historically African American fraternity. It was founded at Howard University in Washington, D.C., on January...

In commutative algebra, the norm of an ideal is a generalization of a norm of an element in the field extension. It is particularly important in number...

Delta Sigma Theta Sorority, Inc. (ΔΣΘ) is a historically African American sorority. The organization was founded by college-educated women dedicated to...

Sigma Pi (ΣΠ) is a collegiate fraternity in North America. As of 2021, it had more than 5,000 undergraduate members and over 118,000 alumni. The fraternity...

account for deviation of a mixture of chemical substances from ideal behaviour. In an ideal mixture, the microscopic interactions between each pair of chemical...

∘ = σ T 4 . {\displaystyle M^{\circ }=\sigma \,T^{4}.} The constant of proportionality, σ {\displaystyle \sigma } , is called the Stefan–Boltzmann constant...

{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}}}...

{\displaystyle \alpha \theta (F)=\sum _{\sigma \in G_{F}}a_{\sigma }\sigma \in \mathbb {Z} [G_{F}]} and if J is any fractional ideal of F, then ∏ σ ∈ G F σ ( J a...

"ideal of transcending racial, national, and religious differences." Beta Sigma Rho was founded at Cornell University on October 12, 1910. Beta Sigma Rho...

The scale-free ideal gas (SFIG) is a physical model assuming a collection of non-interacting elements with a stochastic proportional growth. It is the...

that year and by Hermann Weyl in 1928: σ x σ p ≥ ℏ 2 {\displaystyle \sigma _{x}\sigma _{p}\geq {\frac {\hbar }{2}}} where ℏ = h 2 π {\displaystyle \hbar...

Scholarship Committee determines to best exemplify the ideals of Phi Eta Sigma. Phi Eta Sigma has two publications which it distributes to its members...

Phi Sigma Alpha (ΦΣΑ), commonly known as La Sigma, is a Puerto Rican fraternity originally established as the Sigma Delta Alpha Fraternity (Sociedad de...

Alpha Sigma Phi (ΑΣΦ), commonly known as Alpha Sig, is an intercollegiate men's social fraternity with 181 active chapters and provisional chapters. Founded...

Sigma Tau Gamma (ΣΤΓ), commonly known as Sig Tau, is a United States college social fraternity founded on June 28, 1920, at the University of Central...

Pauli matrices σ ± = ( σ x ± i σ y ) / 2 {\displaystyle \sigma _{\pm }=(\sigma _{x}\pm i\sigma _{y})/2} . An operand Q {\displaystyle Q} that satisfies...