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  2. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    In 3-space n = 3, the axis of a non-null proper rotation is always a unique line, and a rotation around this axis by angle θ has eigenvalues λ = 1, e iθ, e −iθ. In 4-space n = 4 , the four eigenvalues are of the form e ± iθ , e ± iφ .

  3. John J. Mooney - Wikipedia

    en.wikipedia.org/wiki/John_J._Mooney

    Carl D. Keith and John J. Mooney (right) at the award ceremony for the National Medal of Technology and Innovation for the invention, application and commercialization of the three-way catalytic converter (2003) Mooney was elected a Fellow of Society of Automotive Engineers (SAE) in 1990 for his efforts in exhaust emission control.

  4. Active and passive transformation - Wikipedia

    en.wikipedia.org/wiki/Active_and_passive...

    In the passive transformation (right), point P stays fixed, while the coordinate system rotates counterclockwise by an angle θ about its origin. The coordinates of P ′ after the active transformation relative to the original coordinate system are the same as the coordinates of P relative to the rotated coordinate system.

  5. Catalytic converter - Wikipedia

    en.wikipedia.org/wiki/Catalytic_converter

    A three-way catalytic converter on a gasoline-powered 1996 Dodge Ram Simulation of flow inside a catalytic converter. A catalytic converter is an exhaust emission control device which converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction.

  6. Barnsley fern - Wikipedia

    en.wikipedia.org/wiki/Barnsley_fern

    In the matrix representation, it is seen to be a near-90° counterclockwise rotation, scaled down to approximately 30% size with a translation in the positive y direction. In the iterative generation, it is applied with probability 7% and is intuitively responsible for the generation of the lower-left leaf. f 4 x n + 1 = −0.15 x n + 0.28 y n

  7. LA retiree gets shocking surprise 3 years after car’s ... - AOL

    www.aol.com/finance/la-retiree-gets-shocking...

    Claudette Hill was one of many L.A. car owners who had their catalytic converters stolen during a rash of thefts in 2020. Right away, the retired seamstress got the auto part replaced.

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