Xi (letter): Difference between revisions

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Xi (uppercase Ξ, lowercase ξ) is the 14th letter of the Greek alphabet. It is IPA: [ksi] in Modern Greek, and generally Template:PronEng (UK) or /ˈzaɪ/ (US) in English. In the system of Greek numerals, it has a value of 60. Its Latin equivalent is X.

The lower-case letter ξ is used as a symbol for

A joined variant of Ξ.

random variables;
extent of reaction (a topic found most often in chemical engineering kinetics);
eigenvectors;
a parameter in a generalized Pareto distribution;
the symmetric function equation of the Riemann zeta function in mathematics, also known as the Riemann Xi function;
the damping factor in an RLC circuit;
a universal set in the set theory;
a number used in the error term of Newton-Cotes formulas that falls between a and b;
one of the two different polypeptide chains of the human embryonic hemoglobin types Hb-Portland (ξ₂γ₂) and Hb-Gower I (ξ₂ε₂);
the correlation function in astronomy;
frequency.

The upper-case letter Ξ is used as symbol for

Xi was also adopted into the early Cyrillic alphabet, as the letter ksi (Ѯ, ѯ).

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 *the [[damping factor]] in an [[RLC circuit]];
 *a universal set in the [[set theory]];
+*a number used in the error term of [[Newton-Cotes formulas]] that falls between a and b;
 *one of the two different polypeptide chains of the human embryonic [[hemoglobin]] types Hb-Portland (ξ<sub>2</sub>γ<sub>2</sub>) and Hb-Gower I (ξ<sub>2</sub>ε<sub>2</sub>);
 *the [[correlation function (astronomy)|correlation function]] in [[astronomy]];