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Airy function. In the physical sciences, the Airy function (or Airy function of the first kind) Ai (x) is a special function named after the British astronomer George Biddell Airy (1801–1892). The function Ai (x) and the related function Bi (x), are linearly independent solutions to the differential equation known as the Airy equation or the ...
Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS. It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA). Excel forms part of the Microsoft 365 suite of software.
Autoregressive integrated moving average. In statistics and econometrics, and in particular in time series analysis, an autoregressive integrated moving average ( ARIMA) model is a generalization of an autoregressive moving average (ARMA) model. To better comprehend the data or to forecast upcoming series points, both of these models are fitted ...
The softmax function, also known as softargmax[ 1]: 184 or normalized exponential function, [ 2]: 198 converts a vector of K real numbers into a probability distribution of K possible outcomes. It is a generalization of the logistic function to multiple dimensions, and used in multinomial logistic regression. The softmax function is often used ...
and showed that the arbitrary function () must be unity for all (Lorentz had set = by a different argument) to make the transformations form a group. In an enlarged version of the paper that appeared in 1906 Poincaré pointed out that the combination x 2 + y 2 + z 2 − c 2 t 2 {\displaystyle x^{2}+y^{2}+z^{2}-c^{2}t^{2}} is invariant .
Boolean satisfiability problem. In logic and computer science, the Boolean satisfiability problem (sometimes called propositional satisfiability problem and abbreviated SATISFIABILITY, SAT or B-SAT) is the problem of determining if there exists an interpretation that satisfies a given Boolean formula. In other words, it asks whether the ...
Experts say try it cautiously. Becky Litvintchouk didn’t think she’d be able to manage the mountain of tasks needed to become an entrepreneur. Every other part of her life has been ...
Sum ← Sum + x. SumSq ← SumSq + x × x. Var = (SumSq − (Sum × Sum) / n) / (n − 1) This algorithm can easily be adapted to compute the variance of a finite population: simply divide by n instead of n − 1 on the last line. Because SumSq and (Sum×Sum)/n can be very similar numbers, cancellation can lead to the precision of the result to ...
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