• The Irish logarithm was a system of number manipulation invented by Percy Ludgate for machine multiplication. The system used a combination of mechanical...
    6 KB (694 words) - 15:22, 21 March 2024
  • given real numbers a {\displaystyle a} and b {\displaystyle b} , the logarithm log b ⁡ ( a ) {\displaystyle \log _{b}(a)} is a number x {\displaystyle...
    17 KB (2,537 words) - 07:42, 7 July 2025
  • Irish inventions and discoveries are objects, processes or techniques which owe their existence either partially or entirely to an Irish person. Often...
    22 KB (1,824 words) - 13:25, 28 May 2025
  • ^{5}.} Gaussian logarithm Irish logarithm, a similar technique derived empirically by Percy Ludgate Finite field arithmetic Logarithm table Zech, Julius...
    12 KB (1,385 words) - 05:54, 19 May 2025
  • Thumbnail for Percy Ludgate
    Percy Ludgate (category 20th-century Irish businesspeople)
    but employing unique, discrete "Logarithmic Indexes" (now known as Irish logarithms), as well as a novel memory system utilizing concentric cylinders,...
    18 KB (1,464 words) - 22:49, 22 June 2025
  • Ludgate's engine used multiplication as its basis (using his own discrete Irish logarithms), had the first multiplier-accumulator (MAC), was first to exploit...
    68 KB (1,578 words) - 15:10, 19 June 2025
  • Thumbnail for Division (mathematics)
    calculated with an abacus. Logarithm tables can be used to divide two numbers, by subtracting the two numbers' logarithms, then looking up the antilogarithm...
    25 KB (3,478 words) - 16:38, 15 May 2025
  • Thumbnail for Slide rule
    Slide rule (category Logarithms)
    mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry. It is one of the simplest analog computers. Slide rules...
    67 KB (8,375 words) - 02:53, 23 June 2025
  • Thumbnail for Complex number
    unmodified power and logarithm identities, particularly when naïvely treated as single-valued functions; see failure of power and logarithm identities. For...
    91 KB (12,021 words) - 17:33, 29 May 2025
  • Thumbnail for Ordnance Survey National Grid
    Man). The Irish grid reference system is a similar system created by the Ordnance Survey of Ireland and the Ordnance Survey of Northern Ireland for the...
    19 KB (2,175 words) - 10:16, 2 May 2025
  • Thumbnail for Prime-counting function
    mathematical notation for logarithms. All instances of log(x) without a subscript base should be interpreted as a natural logarithm, also commonly written...
    36 KB (4,660 words) - 20:32, 8 April 2025
  • Thumbnail for Leonhard Euler
    definition of the constant e {\displaystyle e} , the base of the natural logarithm, now known as Euler's number. Euler made contributions to applied mathematics...
    99 KB (10,444 words) - 11:09, 1 July 2025
  • Thumbnail for Quaternion
    {\mathbf {v} }{\|\mathbf {v} \|}}\sin \|\mathbf {v} \|\right),} and the logarithm is ln ⁡ ( q ) = ln ⁡ ‖ q ‖ + v ‖ v ‖ arccos ⁡ a ‖ q ‖ . {\displaystyle...
    97 KB (12,730 words) - 06:25, 7 July 2025
  • Thumbnail for A. W. Faber Model 366
    Model 366 slide rules remain, with only five known to have survived. Irish logarithms, a similar scheme intended for use in a mechanical calculation machine...
    6 KB (570 words) - 02:36, 25 May 2025
  • Thumbnail for Ben Affleck
    March 27, 2015. Maslin, Janet (December 5, 1997). "Good Will Hunting: Logarithms and Biorhythms Test a Young Janitor". The New York Times. Archived from...
    263 KB (21,529 words) - 21:06, 30 June 2025
  • Thumbnail for Culture of the United Kingdom
    development of most major branches of science. John Napier introduced logarithms in the early 17th century as a means to simplify calculations. Michael...
    309 KB (35,139 words) - 19:59, 30 June 2025
  • Thumbnail for Isaac Newton
    Diophantine equations. He approximated partial sums of the harmonic series by logarithms (a precursor to Euler's summation formula) and was the first to use power...
    175 KB (18,745 words) - 12:28, 9 July 2025
  • Thumbnail for Half-life
    t_{1/2}={\frac {\ln(2)}{\lambda }}=\tau \ln(2)} where ln(2) is the natural logarithm of 2 (approximately 0.693).: 112  In chemical kinetics, the value of the...
    17 KB (2,175 words) - 05:07, 18 April 2025
  • Thumbnail for Human Development Index
    one-third weighting). Standard of living, as indicated by the natural logarithm of gross domestic product per capita at purchasing power parity. This...
    42 KB (2,728 words) - 19:13, 1 July 2025
  • maker of scientific instruments, astronomer, and independent inventor of logarithms MPC · 2481 2482 Perkin 1980 CO Richard S. and Gladys T. Perkin of Perkin-Elmer...
    151 KB (452 words) - 01:03, 4 July 2025
  • Thumbnail for William Oughtred
    English mathematician and Anglican clergyman. After John Napier discovered logarithms and Edmund Gunter created the logarithmic scales (lines, or rules) upon...
    54 KB (6,416 words) - 10:49, 1 July 2025
  • Thumbnail for List of Robin Williams performances
    Maslin, Janet (December 5, 1997). "Good Will Hunting (1997) Film Review; Logarithms and Biorhythms Test a Young Janitor". The New York Times. Archived from...
    76 KB (4,011 words) - 00:40, 5 June 2025
  • Retrieved April 28, 2020. Maslin, Janet (December 5, 1997). "FILM REVIEW; Logarithms and Biorhythms Test a Young Janitor". The New York Times. ISSN 0362-4331...
    65 KB (5,219 words) - 00:36, 9 July 2025
  • Thumbnail for Charles Babbage
    sitting in his rooms in the Analytical Society looking at a table of logarithms, which he knew to be full of mistakes, when the idea occurred to him of...
    114 KB (12,439 words) - 03:55, 6 July 2025
  • Thumbnail for Riemann hypothesis
    integral function, log ⁡ ( x ) {\displaystyle \log(x)} is the natural logarithm of x, and big O notation is used here. It is already known that 1/2 ≤ β ≤ 1...
    127 KB (16,781 words) - 22:34, 19 June 2025
  • Thumbnail for Multiplication
    is tedious and error-prone. Common logarithms were invented to simplify such calculations, since adding logarithms is equivalent to multiplying. The slide...
    49 KB (6,356 words) - 12:59, 3 July 2025
  • Thumbnail for Normal distribution
    evaluation of the logarithm in the last step to be avoided in most cases. These steps can be greatly improved so that the logarithm is rarely evaluated...
    148 KB (21,531 words) - 03:40, 1 July 2025
  • Thumbnail for Carl Friedrich Gauss
    giving an estimation of the number of prime numbers by using the integral logarithm. In 1816, Olbers encouraged Gauss to compete for a prize from the French...
    181 KB (17,941 words) - 14:40, 8 July 2025
  • Thumbnail for History of mathematics
    Bradwardine expressed this by a series of specific examples, but although the logarithm had not yet been conceived, we can express his conclusion anachronistically...
    148 KB (17,050 words) - 18:16, 8 July 2025
  • where goldsmiths made French money to pay for tobacco. That triggered logarithms and slide rules made by clock makers, who also made pressure cookers that...
    55 KB (1,251 words) - 01:49, 4 June 2025