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  2. Delta (letter) - Wikipedia

    en.wikipedia.org/wiki/Delta_(letter)

    Delta (/ ˈ d ɛ l t ə /; [1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, ) [2] is the fourth letter of the Greek alphabet. In the system of Greek numerals , it has a value of four. It was derived from the Phoenician letter dalet 𐤃. [ 3 ]

  3. Glossary of chemistry terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chemistry_terms

    Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...

  4. Sigma Delta Pi - Wikipedia

    en.wikipedia.org/wiki/Sigma_Delta_Pi

    Sigma Delta Pi (ΣΔΠ) is the national collegiate Hispanic honor society (La Sociedad Nacional Honoraria Hispánica). It was established on November 14, 1919, at the University of California at Berkeley .

  5. Delta - Wikipedia

    en.wikipedia.org/wiki/Delta

    Delta commonly refers to: Delta (letter) (Δ or δ), the fourth letter of the Greek alphabet D (NATO phonetic alphabet: "Delta"), the fourth letter in the Latin alphabet

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.

  7. Sigma Kappa Delta - Wikipedia

    en.wikipedia.org/wiki/Sigma_Kappa_Delta

    Sigma Kappa Delta (ΣΚΔ) is an American collegiate honor society for students of English at two-year colleges. It was established in 1996 in Chicago, Illinois. It was established in 1996 in Chicago, Illinois.

  8. Glossary of set theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_set_theory

    1. A delta number is an ordinal of the form ω ω α 2. A limit ordinal Δ (Greek capital delta, not to be confused with a triangle ∆) 1. A set of formulas in the Lévy hierarchy 2. A delta system ε An epsilon number, an ordinal with ω ε =ε η 1. The order type of the rational numbers 2. An eta set, a type of ordered set 3.

  9. Nonstandard calculus - Wikipedia

    en.wikipedia.org/wiki/Nonstandard_calculus

    Namely, the epsilon-delta definition of uniform continuity requires four quantifiers, while the infinitesimal definition requires only two quantifiers. It has the same quantifier complexity as the definition of uniform continuity in terms of sequences in standard calculus, which however is not expressible in the first-order language of the real ...