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  2. 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).

  3. Lambda Theta Phi - Wikipedia

    en.wikipedia.org/wiki/Lambda_Theta_Phi

    Lambda Theta Phi Latin Fraternity, Inc. (ΛΘΦ) is a Latino non-profit social fraternity in the United States with 148 undergraduate chapters and 33 alumni associations. It was founded on December 1, 1975, at Kean University (formerly known as Kean College) in Union, New Jersey .

  4. 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

  5. List of Lambda Theta Phi chapters - Wikipedia

    en.wikipedia.org/wiki/List_of_Lambda_Theta_Phi...

    Lambda Theta Phi is a Latino social fraternity in the United States. It was established in 1975, at Kean University. The fraternity has collegiate and alumni chapters

  6. 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 ...

  7. High school fraternities and sororities - Wikipedia

    en.wikipedia.org/wiki/High_school_fraternities...

    Pi Phi spread to more than 110 chapters before lapsing into solely alumni chapters in the 1980s. Tau Kappa Delta (ΤΚΔ) was formed in 1924 at Pottsville High School in Pottsville Pennsylvania. The fraternity is active as of 2024. Theta Kappa Omega (ΘΚΩ) was founded November 13, 1872. Upsilon Lambda Phi (ΥΛΦ) founded April 5, 1916 ...

  8. 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).

  9. List of Latino fraternities and sororities - Wikipedia

    en.wikipedia.org/wiki/List_of_Latino...

    In New Jersey on December 1, 1975, Lambda Theta Phi Latin Fraternity, Inc. was founded at Kean University in Union Township, New Jersey. [3] With the fraternity's second chapter at Rutgers University–New Brunswick in the fall of 1978, Lambda Theta Phi was well on its way to growing the Latino Greek movement. [4]