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  2. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders. [1] [2] Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart.

  3. Histogram - Wikipedia

    en.wikipedia.org/wiki/Histogram

    A histogram is a visual representation of the distribution of quantitative data. The term was first introduced by Karl Pearson. [1] To construct a histogram, the first step is to "bin" (or "bucket") the range of values— divide the entire range of values into a series of intervals—and then count how many values fall into each interval.

  4. Staple food - Wikipedia

    en.wikipedia.org/wiki/Staple_food

    Various types of potatoes Unprocessed seeds of spelt, a historically important staple food Harvesting Sago pith to produce the starch in Papua New Guinea. A staple food, food staple, or simply staple, is a food that is eaten often and in such quantities that it constitutes a dominant portion of a standard diet for an individual or a population group, supplying a large fraction of energy needs ...

  5. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    For any integer n, n ≡ 1 (mod 2) if and only if ⁠ 3n + 1 / 2 ⁠ ≡ 2 (mod 3). Equivalently, ⁠ 2n − 1 / 3 ⁠ ≡ 1 (mod 2) if and only if n ≡ 2 (mod 3). Conjecturally, this inverse relation forms a tree except for a 12 loop (the inverse of the 12 loop of the function f(n) revised as indicated above).

  6. Tamil numerals - Wikipedia

    en.wikipedia.org/wiki/Tamil_numerals

    2.4.1 Fractions ... 10 1: 10 2: 10 3: 10 4: 10 5: 10 6: 10 9: 10 12: 10 15: 10 18: 10 20: 10 21: Words பத்து நூறு ஆயிரம் ...

  7. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    Name Symbol Decimal expansion Formula Year Set One: 1 1 Prehistory Two: 2 2 Prehistory One half: 1/2 0.5 Prehistory Pi: 3.14159 26535 89793 23846 [Mw 1] [OEIS 1]: Ratio of a circle's circumference to its diameter.

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