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  2. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    theta functions; the angle of a scattered photon during a Compton scattering interaction; the angular displacement of a particle rotating about an axis; the Watterson estimator in population genetics; the thermal resistance between two bodies; ϑ ("script theta"), the cursive form of theta, often used in handwriting, represents

  3. Greek alphabet - Wikipedia

    en.wikipedia.org/wiki/Greek_alphabet

    The name of lambda is attested in early sources as λάβδα besides λάμβδα; [55] [15] in Modern Greek the spelling is often λάμδα, reflecting pronunciation. [15] Similarly, iota is sometimes spelled γιώτα in Modern Greek ( [ʝ] is conventionally transcribed γ{ι,η,υ,ει,οι} word-initially and intervocalically before back ...

  4. Bragg's law - Wikipedia

    en.wikipedia.org/wiki/Bragg's_law

    Bragg diffraction (also referred to as the Bragg formulation of X-ray diffraction) was first proposed by Lawrence Bragg and his father, William Henry Bragg, in 1913 [1] after their discovery that crystalline solids produced surprising patterns of reflected X-rays (in contrast to those produced with, for instance, a liquid).

  5. Spherical coordinate system - Wikipedia

    en.wikipedia.org/wiki/Spherical_coordinate_system

    The physics convention.Spherical coordinates (r, θ, φ) as commonly used: (ISO 80000-2:2019): radial distance r (slant distance to origin), polar angle θ (angle with respect to positive polar axis), and azimuthal angle φ (angle of rotation from the initial meridian plane).

  6. Lambda - Wikipedia

    en.wikipedia.org/wiki/Lambda

    Lambda (/ ˈ l æ m d ə / ⓘ; [1] uppercase Λ, lowercase λ; Greek: λάμ(β)δα, lám(b)da) is the eleventh letter of the Greek alphabet, representing the voiced alveolar lateral approximant IPA:. In the system of Greek numerals, lambda has a value of 30. Lambda is derived from the Phoenician Lamed. Lambda gave rise to the Latin L and the ...

  7. Theta - Wikipedia

    en.wikipedia.org/wiki/Theta

    Theta (UK: / ˈ θ iː t ə /, US: / ˈ θ eɪ t ə /) uppercase Θ or ϴ; lowercase θ [note 1] or ϑ; Ancient Greek: θῆτα thē̂ta [tʰɛ̂ːta]; Modern: θήτα thī́ta) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth.

  8. List of optics equations - Wikipedia

    en.wikipedia.org/wiki/List_of_optics_equations

    Visulization of flux through differential area and solid angle. As always ^ is the unit normal to the incident surface A, = ^, and ^ is a unit vector in the direction of incident flux on the area element, θ is the angle between them.

  9. Durst - Wikipedia

    en.wikipedia.org/wiki/Durst

    The Theta is also capable of holding two different paper types at once. The Durst Lambda is a continuous roll-to-roll single beam, three-laser exposure system giving total size flexibility and achieves an image quality which is superior to all large format printers - photographic, inkjet and electrostatic).