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In mathematics, the infinite series 1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation, this may be expressed as
One half is the rational number that lies midway between 0 and 1 on the number line. Multiplication by one half is equivalent to division by two, or "halving"; conversely, division by one half is equivalent to multiplication by two, or "doubling". A square of side length one, here dissected into rectangles whose areas are successive powers of ...
For example, if 1 / 2 represents a half-dollar profit, then − 1 / 2 represents a half-dollar loss. Because of the rules of division of signed numbers (which states in part that negative divided by positive is negative), − 1 / 2 , −1 / 2 and 1 / −2 all represent the same fraction – negative one-half.
However, up until 2022 [1] a spirit measure in the Isle of Man is still defined as 1 ⁄ 5 gill (28.4 mL) and 1 ⁄ 6 gill (23.7 mL) in Northern Ireland. [ 2 ] [ 3 ] Half of a gill is a jack, or an eighth of a pint. [ 4 ]
Alternatively, and for greater numbers, one may say for 1 ⁄ 2 "one over two", for 5 ⁄ 8 "five over eight", and so on. This "over" form is also widely used in mathematics. Fractions together with an integer are read as follows: 1 + 1 ⁄ 2 is "one and a half" 6 + 1 ⁄ 4 is "six and a quarter" 7 + 5 ⁄ 8 is "seven and five eighths"
1 ⁄ 8: 12.5 4: 1 ⁄ 16: 6.25 5: 1 ⁄ 32: 3 ... the actual half-life T ½ can be related to the half-lives t 1 and t 2 that the quantity would have if each of the ...
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Note Rest American name British name Relative value Dotted value Double dotted value Triple dotted value; large, duplex longa, or maxima [1] [2] (occasionally octuple note, [3] octuple whole note, [4] or octuple entire musical note) [5]