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  2. Fourier number - Wikipedia

    en.wikipedia.org/wiki/Fourier_number

    In the study of heat conduction, the Fourier number, is the ratio of time, , to a characteristic time scale for heat diffusion, . This dimensionless group is named in honor of J.B.J. Fourier , who formulated the modern understanding of heat conduction. [ 1 ]

  3. IRS tax forms - Wikipedia

    en.wikipedia.org/wiki/IRS_tax_forms

    As of the 2018 tax year, Form 1040, U.S. Individual Income Tax Return, is the only form used for personal (individual) federal income tax returns filed with the IRS. In prior years, it had been one of three forms (1040 [the "Long Form"], 1040A [the "Short Form"] and 1040EZ – see below for explanations of each) used for such returns.

  4. File:Form 1040, 2015.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Form_1040,_2015.pdf

    Original file (1,275 × 1,650 pixels, file size: 188 KB, MIME type: application/pdf, 2 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

  5. File:IRS Form 1040, 2018.pdf - Wikipedia

    en.wikipedia.org/wiki/File:IRS_Form_1040,_2018.pdf

    Short title: 2018 Form 1040: Image title: U.S. Individual Income Tax Return: Author: SE:W:CAR:MP: Keywords: Fillable: Software used: Adobe LiveCycle Designer ES 9.0

  6. Harmonic analysis - Wikipedia

    en.wikipedia.org/wiki/Harmonic_analysis

    Harmonic analysis is a branch of mathematics concerned with investigating the connections between a function and its representation in frequency.The frequency representation is found by using the Fourier transform for functions on unbounded domains such as the full real line or by Fourier series for functions on bounded domains, especially periodic functions on finite intervals.

  7. Cusp form - Wikipedia

    en.wikipedia.org/wiki/Cusp_form

    For example, the Ramanujan tau function τ(n) arises as the sequence of Fourier coefficients of the cusp form of weight 12 for the modular group, with a 1 = 1. The space of such forms has dimension 1, which means this definition is possible; and that accounts for the action of Hecke operators on the space being by scalar multiplication (Mordell ...