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The Greek alphabet on a black-figure pottery vessel, with an archaic chickenfoot-shaped psi.. Psi / ˈ (p) s aɪ, ˈ (p) s iː / (P)SY, (P)SEE [1] (uppercase Ψ, lowercase ψ or 𝛙; Greek: ψι psi) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700.
Psi (Greek) (Ψ or ψ), the twenty-third letter of the Greek alphabet; Psi (Cyrillic), letter of the early Cyrillic alphabet, adopted from Greek; Arts and entertainment
Greek also introduced three new consonant letters for its aspirated plosive sounds and consonant clusters: Φ for /pʰ/, Χ for /kʰ/ and Ψ for /ps/. In western Greek variants, Χ was instead used for /ks/ and Ψ for /kʰ/. The origin of these letters is a matter of some debate.
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
The latter will sparsely be used here, it is only needed to obtain a precise definition of what it means for a subset of a function space to be closed. It will be concluded below that the function space of wave functions is a Hilbert space. This observation is the foundation of the predominant mathematical formulation of quantum mechanics.
Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian
On Capitol Hill, lawmakers scrambled to figure out what the funding freeze would mean for their constituents. “The scope of what you are ordering is breathtaking, unprecedented, and will have ...
Psi (Ѱ, ѱ; italics: Ѱ ѱ) is a letter in the early Cyrillic alphabet, derived from the Greek letter of the same name (Ψ, ψ). It represents the sound /ps/, as in English naps .