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Xi (uppercase/lowercase Ξ ξ) is the 14th letter of the Greek alphabet. It is used to represent the "x" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 60. The Roman letter X and Cyrillic letter Ѯ came from Xi.

In mathematics, both uppercase Ξ and lowercase ξ are used to refer to variants of Riemann Xi function (itself a variant of Riemann zeta function).^[1] In physics, the uppercase Ξ is used to represent the cascade particle and xi baryon.^[2]

References

↑ "Greek/Hebrew/Latin-based Symbols in Mathematics". Math Vault. 2020-03-20. Retrieved 2020-10-06.
↑ "Xi Symbol in Greek Alphabet". www.greeksymbols.net. Retrieved 2020-10-06.

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[1] "Greek/Hebrew/Latin-based Symbols in Mathematics". Math Vault. 2020-03-20. Retrieved 2020-10-06.

[2] "Xi Symbol in Greek Alphabet". www.greeksymbols.net. Retrieved 2020-10-06.

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-{{Greek alphabet sidebar|letter=xi uc lc}}
+{{Greek alphabet|letter=xi}}
+'''Xi''' (uppercase/lowercase '''Ξ ξ''') is the 14th letter of the [[Greek alphabet]]. It is used to represent the "x" sound in [[Ancient Greek|Ancient]] and [[Modern Greek language|Modern]] Greek. In the system of [[Greek numerals]], it has a value of 60. The Roman letter [[X]] and Cyrillic letter [[Ѯ]] came from Xi.
+In [[mathematics]], both uppercase Ξ and lowercase ξ are used to refer to variants of [[Riemann xi function|Riemann Xi function]] (itself a variant of [[Riemann zeta function]]).<ref>{{Cite web|date=2020-03-20|title=Greek/Hebrew/Latin-based Symbols in Mathematics|url=https://mathvault.ca/hub/higher-math/math-symbols/greek-hebrew-latin-symbols/|access-date=2020-10-06|website=Math Vault|language=en-US}}</ref> In [[physics]], the uppercase Ξ is used to represent the [[cascade particle]] and [[xi baryon]].<ref>{{Cite web|title=Xi Symbol in Greek Alphabet|url=https://www.greeksymbols.net/xi-symbol|access-date=2020-10-06|website=www.greeksymbols.net|language=en}}</ref>
-'''Xi''' (uppercase/lowercase '''Ξ ξ'''), is the 14th letter of the [[Greek alphabet]], used to represent the "x" sound in [[Ancient Greek|Ancient]] and [[Modern Greek language|Modern]] Greek. In the system of [[Greek numerals]], it has a value of 60. The Roman letter [[X]] and Cyrillic letter [[Ѯ]] came from Xi.
+== References ==
-{{stub}}
+<references />
 [[Category:Greek alphabet]]
+{{Europe-stub}}