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What (who) is φιλονικία ψ - definition
WIKIMEDIA DISAMBIGUATION PAGE
Ψ Aquarii; Psi Aqr
Psi (Greek)
TWENTY-THIRD LETTER OF THE GREEK ALPHABET
Ψ; \psi; Ψῖ; Psi (Greek letter); Psi (letter)
Psi (uppercase , lowercase ; psi ) is the 23rd letter of the Greek alphabet and is associated with a numeric value of 700. In both Classical and Modern Greek, the letter indicates the combination (as in English word "lapse").
Buchholz's ordinal
THE PROOF‐THEORETIC ORDINAL OF THE SUBSYSTEM Π₁¹‐CA₀ OF 2ND‐ORDER ARITHMETIC
Psi0(Omega omega); Ψ₀(Ωω); Ψ0(Ωω); Buchholz ordinal
In mathematics, ψ0(Ωω), widely known as Buchholz's ordinal, is a large countable ordinal that is used to measure the proof-theoretic strength of some mathematical systems. In particular, it is the proof theoretic ordinal of the subsystem \Pi_1^1-CA0 of second-order arithmetic; this is one of the "big five" subsystems studied in reverse mathematics (Simpson 1999).
Psi Piscium
STAR
Ψ Piscium
The Bayer designation Psi Piscium (ψ Psc, ψ Piscium) is shared by three star systems in the constellation Pisces:
Wikipedia
Psi Aquarii
The Bayer designation ψ Aquarii (psi Aquarii, ψ Aqr) is shared by three stars/star systems in the constellation Aquarius:
- ψ1 Aquarii (91 Aquarii), a multiple star system with an exoplanet orbiting the giant primary
- ψ2 Aquarii (93 Aquarii), a solitary Be star
- ψ3 Aquarii (95 Aquarii), a binary star system
All of them were members of the asterism 羽林軍 (Yǔ Lín Jūn), Palace Guard, in the Encampment mansion.
