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  2. Permeability (electromagnetism) - Wikipedia

    en.wikipedia.org/wiki/Permeability...

    Values shown above are approximate and valid only at the magnetic fields shown. They are given for a zero frequency; in practice, the permeability is generally a function of the frequency. When the frequency is considered, the permeability can be complex , corresponding to the in-phase and out of phase response.

  3. Risk–return spectrum - Wikipedia

    en.wikipedia.org/wiki/Risk–return_spectrum

    This line starts at the risk-free rate and rises as risk rises. The line will tend to be straight, and will be straight at equilibrium (see discussion below on domination). For any particular investment type, the line drawn from the risk-free rate on the vertical axis to the risk-return point for that investment has a slope called the Sharpe ratio.

  4. Pie chart - Wikipedia

    en.wikipedia.org/wiki/Pie_chart

    Pie chart of populations of English native speakers. A pie chart (or a circle chart) is a circular statistical graphic which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area) is proportional to the quantity it represents.

  5. Computing the permanent - Wikipedia

    en.wikipedia.org/wiki/Computing_the_permanent

    The best known [1] general exact algorithm is due to H. J. Ryser ().Ryser's method is based on an inclusion–exclusion formula that can be given [2] as follows: Let be obtained from A by deleting k columns, let () be the product of the row-sums of , and let be the sum of the values of () over all possible .

  6. Citrus taxonomy - Wikipedia

    en.wikipedia.org/wiki/Citrus_taxonomy

    Initially, many citrus types were identified and named by individual taxonomists, resulting in a large number of identified species: 870 by a 1969 count. [18] Some order was brought to citrus taxonomy by two unified classification schemes, those of Chōzaburō Tanaka and Walter Tennyson Swingle, that can be viewed as extreme alternative visions of the genus.

  7. List of loanwords in the Tagalog language - Wikipedia

    en.wikipedia.org/wiki/List_of_loanwords_in_Tagalog

    An example is the Tagalog word libre, which is derived from the Spanish translation of the English word free, although used in Tagalog with the meaning of "without cost or payment" or "free of charge", a usage which would be deemed incorrect in Spanish as the term gratis would be more fitting; Tagalog word libre can also mean free in aspect of ...