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  2. Involute - Wikipedia

    en.wikipedia.org/wiki/Involute

    In mathematics, an involute (also known as an evolvent) is a particular type of curve that is dependent on another shape or curve. An involute of a curve is the locus of a point on a piece of taut string as the string is either unwrapped from or wrapped around the curve. [1] The evolute of an involute is the original curve.

  3. Involutory matrix - Wikipedia

    en.wikipedia.org/wiki/Involutory_matrix

    In mathematics, an involutory matrix is a square matrix that is its own inverse.That is, multiplication by the matrix is an involution if and only if =, where is the identity matrix.

  4. Envelope (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(mathematics)

    The envelope E 1 is the limit of intersections of nearby curves C t.; The envelope E 2 is a curve tangent to all of the C t.; The envelope E 3 is the boundary of the region filled by the curves C t.

  5. Matrix calculus - Wikipedia

    en.wikipedia.org/wiki/Matrix_calculus

    In mathematics, matrix calculus is a specialized notation for doing multivariable calculus, especially over spaces of matrices.It collects the various partial derivatives of a single function with respect to many variables, and/or of a multivariate function with respect to a single variable, into vectors and matrices that can be treated as single entities.

  6. Involute gear - Wikipedia

    en.wikipedia.org/wiki/Involute_gear

    The involute gear profile, sometimes credited to Leonhard Euler, [1] was a fundamental advance in machine design, since unlike with other gear systems, the tooth profile of an involute gear depends only on the number of teeth on the gear, pressure angle, and pitch. That is, a gear's profile does not depend on the gear it mates with.

  7. Australia says remaining 'Bali Nine' members have returned ...

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    SYDNEY (Reuters) -The remaining five members of the "Bali Nine" Australian drug ring have returned from Indonesia after diplomatic efforts between the countries this month to strike a repatriation ...

  8. Fans liked what they saw, too. "From Terminator to Santa, that’s the right path 💪🏻" one person wrote in the comments section. "This is the Hallmark Christmas Movie we deserve 🤣" another ...

  9. 'Landman' Star Billy Bob Thornton Makes Rare Appearance With ...

    www.aol.com/landman-star-billy-bob-thornton...

    The event marked Thornton's seventh Golden Globe nomination.