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  2. Lissajous curve - Wikipedia

    en.wikipedia.org/wiki/Lissajous_curve

    [1] [2] [3] Such motions may be considered as a particular kind of complex harmonic motion. The appearance of the figure is sensitive to the ratio ⁠ a / b ⁠ . For a ratio of 1, when the frequencies match a=b, the figure is an ellipse , with special cases including circles ( A = B , δ = ⁠ π / 2 ⁠ radians ) and lines ( δ = 0 ).

  3. Coefficient of restitution - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_restitution

    The COR is a property of a pair of objects in a collision, not a single object. If a given object collides with two different objects, each collision has its own COR. When a single object is described as having a given coefficient of restitution, as if it were an intrinsic property without reference to a second object, some assumptions have been made – for example that the collision is with ...

  4. Relative change - Wikipedia

    en.wikipedia.org/wiki/Relative_change

    A percentage change is a way to express a change in a variable. It represents the relative change between the old value and the new one. [6]For example, if a house is worth $100,000 today and the year after its value goes up to $110,000, the percentage change of its value can be expressed as = = %.

  5. Symmetric mean absolute percentage error - Wikipedia

    en.wikipedia.org/wiki/Symmetric_mean_absolute...

    In contrast to the mean absolute percentage error, SMAPE has both a lower and an upper bound. Indeed, the formula above provides a result between 0% and 200%. Indeed, the formula above provides a result between 0% and 200%.

  6. Propagation of uncertainty - Wikipedia

    en.wikipedia.org/wiki/Propagation_of_uncertainty

    Any non-linear differentiable function, (,), of two variables, and , can be expanded as + +. If we take the variance on both sides and use the formula [11] for the variance of a linear combination of variables ⁡ (+) = ⁡ + ⁡ + ⁡ (,), then we obtain | | + | | +, where is the standard deviation of the function , is the standard deviation of , is the standard deviation of and = is the ...

  7. Biden to cancel even more student debt, prioritize Ukraine ...

    www.aol.com/biden-cancel-even-more-student...

    Biden has already wiped away more than $175 billion in loans for millions of student borrowers, as part of a 2020 campaign promise to eliminate their debt.

  8. Approximation error - Wikipedia

    en.wikipedia.org/wiki/Approximation_error

    Best rational approximants for π (green circle), e (blue diamond), ϕ (pink oblong), (√3)/2 (grey hexagon), 1/√2 (red octagon) and 1/√3 (orange triangle) calculated from their continued fraction expansions, plotted as slopes y/x with errors from their true values (black dashes)

  9. US issues fresh sanctions related to Nord Stream 2 pipeline - AOL

    www.aol.com/news/us-issues-fresh-sanctions...

    WASHINGTON (Reuters) -The United States issued fresh sanctions on Wednesday on several Russia-based entities over their involvement in the Nord Stream 2 gas pipeline, the State Department said ...