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  2. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    For example, a 5.0 earthquake releases 32 times (10 1.5) and a 6.0 releases 1000 times (10 3) the energy of a 4.0. [61] Apparent magnitude measures the brightness of stars logarithmically. [62] In chemistry the negative of the decimal logarithm, the decimal cologarithm, is indicated by the letter p. [63]

  3. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    For example, he named the square root of minus 1 with the symbol i, and he popularized the use of the Greek letter to stand for the ratio of a circle's circumference to its diameter. He made numerous contributions to the study of topology, graph theory, calculus, combinatorics, and complex analysis, as evidenced by the multitude of theorems and ...

  4. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    A number containing two or more decimal digits is built by appending the Roman numeral equivalent for each, from highest to lowest, as in the following examples: 39 = XXX + IX = XXXIX . 246 = CC + XL + VI = CCXLVI .

  5. e (mathematical constant) - Wikipedia

    en.wikipedia.org/wiki/E_(mathematical_constant)

    The number e is a mathematical constant approximately equal to 2.71828 that is the base of the natural logarithm and exponential function.It is sometimes called Euler's number, after the Swiss mathematician Leonhard Euler, though this can invite confusion with Euler numbers, or with Euler's constant, a different constant typically denoted .

  6. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    pH can be measured using indicators, which change color depending on the pH of the solution they are in. By comparing the color of a test solution to a standard color chart, the pH can be estimated to the nearest whole number. For more precise measurements, the color can be measured using a colorimeter or spectrophotometer.

  7. World population - Wikipedia

    en.wikipedia.org/wiki/World_population

    Estimates of world population by their nature are an aspect of modernity, possible only since the Age of Discovery.Early estimates for the population of the world [10] date to the 17th century: William Petty, in 1682, estimated the world population at 320 million (current estimates ranging close to twice this number); by the late 18th century, estimates ranged close to one billion (consistent ...

  8. List of Young Sheldon episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Young_Sheldon_episodes

    After realizing how much money Richard Simmons makes, Georgie decides to make his exercise video, turning to the drama teacher Mr. Lundy (Jason Alexander), for help. Mr. Lundy turns it into a cowboy aerobics theme, and Georgie convinces Connie to invest in him as her grandson. However, Connie and Georgie back out when Mr. Lundy wants 80% of the ...

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