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  2. Borderline tree - Wikipedia

    en.wikipedia.org/wiki/Borderline_tree

    Basal Area Factor (BAF) 5, 10, and 20 angle gauges result in PRFs of 3.89, 2.75, and 1.94 (feet inch −1) respectively. The metric equivalents of these PRFs are 0.467, 0.33, and 0.233 (m cm −1 ). When a tree is borderline, a series of measurements and calculations must be made to determine if the tree is in or out.

  3. 2021 Formula 2 Championship - Wikipedia

    en.wikipedia.org/wiki/2021_Formula_2_Championship

    Oscar Piastri (pictured in 2019) won the championship. The team he drove with, Prema Racing successfully defended their title as Teams' Champions. The 2021 FIA Formula 2 Championship was a motor racing championship for Formula 2 cars that was sanctioned by the Fédération Internationale de l'Automobile (FIA).

  4. 2019 Formula 2 Championship - Wikipedia

    en.wikipedia.org/wiki/2019_Formula_2_Championship

    Nyck de Vries won the championship, driving for ART Grand Prix. The season was overshadowed by the fatal accident suffered by Anthoine Hubert at Spa.. The 2019 FIA Formula 2 Championship was the fifty-third season of the second-tier of Formula One feeder championship and also third season under the moniker of FIA Formula 2 Championship, a motor racing championship for Formula 2 cars that is ...

  5. Šidák correction - Wikipedia

    en.wikipedia.org/wiki/Šidák_correction

    The Šidák correction is derived by assuming that the individual tests are independent. Let the significance threshold for each test be α 1 {\displaystyle \alpha _{1}} ; then the probability that at least one of the tests is significant under this threshold is (1 - the probability that none of them are significant).

  6. 2022 Formula 2 Championship - Wikipedia

    en.wikipedia.org/wiki/2022_Formula_2_Championship

    The 2022 FIA Formula 2 Championship was a motor racing championship for Formula 2 cars that was sanctioned by the Fédération Internationale de l'Automobile (FIA). The championship was the fifty-sixth season of Formula 2 racing and the sixth season ran under the FIA Formula 2 Championship moniker.

  7. Euler's formula - Wikipedia

    en.wikipedia.org/wiki/Euler's_formula

    Euler's formula is ubiquitous in mathematics, physics, chemistry, and engineering. The physicist Richard Feynman called the equation "our jewel" and "the most remarkable formula in mathematics". [2] When x = π, Euler's formula may be rewritten as e iπ + 1 = 0 or e iπ = −1, which is known as Euler's identity.

  8. Prism (optics) - Wikipedia

    en.wikipedia.org/wiki/Prism_(optics)

    Prism spectacles with a single prism perform a relative displacement of the two eyes, thereby correcting eso-, exo, hyper- or hypotropia. In contrast, spectacles with prisms of equal power for both eyes, called yoked prisms (also: conjugate prisms, ambient lenses or performance glasses) shift the visual field of both eyes to the same extent. [5]

  9. Prism compressor - Wikipedia

    en.wikipedia.org/wiki/Prism_compressor

    Figure 2. Geometry of a prism compressor Figure 3. Effective pathlength for a prism compressor with A = 100 mm, θ = 55°, and α = 10°. The colors correspond to different values of B, where B = 67.6 mm means that the beam barely hits the tips of both prisms at refractive index 1.6.