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  2. Luminosity function (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Luminosity_function...

    Luminosity functions are used to study the properties of large groups or classes of objects, such as the stars in clusters or the galaxies in the Local Group. Note that the term "function" is slightly misleading, and the luminosity function might better be described as a luminosity distribution. Given a luminosity as input, the luminosity ...

  3. Press–Schechter formalism - Wikipedia

    en.wikipedia.org/wiki/Press–Schechter_formalism

    The Press–Schechter formalism predicts that the number of objects with mass between and + is: = (+) ¯ (+) / ⁡ (() (+) /). where is the index of the power spectrum of the fluctuations in the early universe (), ¯ is the mean (baryonic and dark) matter density of the universe at the time the fluctuation from which the object was formed had gravitationally collapsed, and is a cut-off mass ...

  4. Thomas theorem - Wikipedia

    en.wikipedia.org/wiki/Thomas_theorem

    The definition of the situation is a fundamental concept in symbolic interactionism. [ 4 ] [ 5 ] It involves a proposal upon the characteristics of a social situation (e.g. norms, values, authority, participants' roles), and seeks agreement from others in a way that can facilitate social cohesion and social action.

  5. Probability density function - Wikipedia

    en.wikipedia.org/wiki/Probability_density_function

    In this example, the ratio (probability of living during an interval) / (duration of the interval) is approximately constant, and equal to 2 per hour (or 2 hour −1). For example, there is 0.02 probability of dying in the 0.01-hour interval between 5 and 5.01 hours, and (0.02 probability / 0.01 hours) = 2 hour −1.

  6. Two-factor theory of emotion - Wikipedia

    en.wikipedia.org/wiki/Two-factor_theory_of_emotion

    Third, that if a person is put in a situation that in the past could have made them feel an emotion, they will react emotionally or experience emotions only if they are in a state of physiological arousal. [1] Participants were told they were being injected with a new drug called "Suproxin" to test their eyesight.

  7. Schechter: Life Insurance 'Gets A Bad Rap' - AOL

    www.aol.com/news/schechter-life-insurance-gets...

    You invest $100,000 in a rental home with a friend to be used as a passive income generator. Ten years later, the principal mortgage is paid off and the investment is worth $150,000. You’re ...

  8. Normal distribution - Wikipedia

    en.wikipedia.org/wiki/Normal_distribution

    The moment generating function of a real random variable ⁠ ⁠ is the expected value of , as a function of the real parameter ⁠ ⁠. For a normal distribution with density ⁠ f {\displaystyle f} ⁠ , mean ⁠ μ {\displaystyle \mu } ⁠ and variance σ 2 {\textstyle \sigma ^{2}} , the moment generating function exists and is equal to

  9. Functional analysis - Wikipedia

    en.wikipedia.org/wiki/Functional_analysis

    Functional analysis is a branch of mathematical analysis, the core of which is formed by the study of vector spaces endowed with some kind of limit-related structure (for example, inner product, norm, or topology) and the linear functions defined on these spaces and suitably respecting these structures.