Mathematical table

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trigonometric functions
. Angles less than 45° are found on the left page, angles greater than 45° on the right. Cosine, cotangent and cosecant are found by using the entry on the opposite page.

Mathematical tables are lists of numbers showing the results of a calculation with varying arguments.

trigonometric functions
were common in math and science textbooks, and specialized tables were published for numerous applications.

History and use

The first tables of

sine function.[1] The table produced by the Indian mathematician Āryabhaṭa (476–550 CE) is considered the first sine table ever constructed.[1]
Āryabhaṭa's table remained the standard sine table of ancient India. There were continuous attempts to improve the accuracy of this table, culminating in the discovery of the power series expansions of the sine and cosine functions by Madhava of Sangamagrama (c.1350 – c.1425), and the tabulation of a sine table by Madhava with values accurate to seven or eight decimal places.

College Entrance Examination Board
to students taking the mathematics portions of the tests

Tables of common logarithms were used until the invention of computers and electronic calculators to do rapid multiplications, divisions, and exponentiations, including the extraction of nth roots.

Mechanical special-purpose computers known as

human computers of the time. Early digital computers were developed during World War II in part to produce specialized mathematical tables for aiming artillery. From 1972 onwards, with the launch and growing use of scientific calculators
, most mathematical tables went out of use.

One of the last major efforts to construct such tables was the Mathematical Tables Project that was started in the United States in 1938 as a project of the Works Progress Administration (WPA), employing 450 out-of-work clerks to tabulate higher mathematical functions. It lasted through World War II.[2]

Tables of special functions are still used. For example, the use of tables of values of the cumulative distribution function of the normal distribution – so-called standard normal tables – remains commonplace today, especially in schools, although the use of scientific and graphing calculators as well as spreadsheet and dedicated statistical software on personal computers is making such tables redundant.

Creating tables stored in

code optimization technique in computer programming, where the use of such tables speeds up calculations in those cases where a table lookup is faster than the corresponding calculations (particularly if the computer in question doesn't have a hardware implementation of the calculations). In essence, one trades computing speed for the computer memory space
required to store the tables.

Trigonometric tables

Main article: Trigonometric tables

Trigonometric calculations played an important role in the early study of astronomy. Early tables were constructed by repeatedly applying

trigonometric identities
(like the half-angle and angle-sum identities) to compute new values from old ones.

A simple example

To compute the

sine
function of 75 degrees, 9 minutes, 50 seconds using a table of trigonometric functions such as the Bernegger table from 1619 illustrated above, one might simply round up to 75 degrees, 10 minutes and then find the 10 minute entry on the 75 degree page, shown above-right, which is 0.9666746.

However, this answer is only accurate to four decimal places. If one wanted greater accuracy, one could

interpolate
linearly as follows:

From the Bernegger table:

sin (75° 10′) = 0.9666746
sin (75° 9′) = 0.9666001

The difference between these values is 0.0000745.

Since there are 60 seconds in a minute of arc, we multiply the difference by 50/60 to get a correction of (50/60)*0.0000745 ≈ 0.0000621; and then add that correction to sin (75° 9′) to get :

sin (75° 9′ 50″) ≈ sin (75° 9′) + 0.0000621 = 0.9666001 + 0.0000621 = 0.9666622

A modern calculator gives sin(75° 9′ 50″) = 0.96666219991, so our interpolated answer is accurate to the 7-digit precision of the Bernegger table.

For tables with greater precision (more digits per value), higher order interpolation may be needed to get full accuracy.[3] In the era before electronic computers, interpolating table data in this manner was the only practical way to get high accuracy values of mathematical functions needed for applications such as navigation, astronomy and surveying.

To understand the importance of accuracy in applications like navigation note that at sea level one minute of arc along the Earth's equator or a meridian (indeed, any great circle) equals one nautical mile (approximately 1.852 km or 1.151 mi).

Tables of logarithms

A page from Henry Briggs' 1617 Logarithmorum Chilias Prima showing the base-10 (common) logarithm of the integers 0 to 67 to fourteen decimal places.
Part of a 20th-century table of common logarithms in the reference book Abramowitz and Stegun.
American Practical Navigator. Columns of differences are included to aid interpolation
.

Tables containing common logarithms (base-10) were extensively used in computations prior to the advent of electronic calculators and computers because logarithms convert problems of multiplication and division into much easier addition and subtraction problems. Base-10 logarithms have an additional property that is unique and useful: The common logarithm of numbers greater than one that differ only by a factor of a power of ten all have the same fractional part, known as the mantissa. Tables of common logarithms typically included only the mantissas; the integer part of the logarithm, known as the characteristic, could easily be determined by counting digits in the original number. A similar principle allows for the quick calculation of logarithms of positive numbers less than 1. Thus a single table of common logarithms can be used for the entire range of positive decimal numbers.[4] See common logarithm for details on the use of characteristics and mantissas.

History

Main article: History of logarithms

In 1544, Michael Stifel published Arithmetica integra, which contains a table of integers and powers of 2 that has been considered an early version of a logarithmic table.[5][6][7]

The method of logarithms was publicly propounded by

Napier's logarithms to form what is now known as the common or base-10 logarithms. Napier delegated to Briggs the computation of a revised table. In 1617, they published Logarithmorum Chilias Prima ("The First Thousand Logarithms"), which gave a brief account of logarithms and a table for the first 1000 integers calculated to the 14th decimal place. Prior to Napier's invention, there had been other techniques of similar scopes, such as the use of tables of progressions, extensively developed by Jost Bürgi around 1600.[9][10]

The computational advance available via common logarithms, the converse of powered numbers or

exponential notation
, was such that it made calculations by hand much quicker.

See also

References

  1. ^ a b J J O'Connor and E F Robertson (June 1996). "The trigonometric functions". Retrieved 4 March 2010.
  2. ISSN 1058-6180
    .
  3. ^ Abramowitz and Stegun Handbook of Mathematical Functions, Introduction §4
  4. ^ E. R. Hedrick, Logarithmic and Trigonometric Tables (Macmillan, New York, 1913).
  5. ^ Stifelio, Michaele (1544), Arithmetica Integra, London: Iohan Petreium
  6. ^ Bukhshtab, A.A.; Pechaev, V.I. (2001) [1994], "Arithmetic", Encyclopedia of Mathematics, EMS Press
  7. ^ Vivian Shaw Groza and Susanne M. Shelley (1972), Precalculus mathematics, New York: Holt, Rinehart and Winston, p. 182,
    ISBN 978-0-03-077670-0
  8. ^ Ernest William Hobson (1914), John Napier and the invention of logarithms, 1614, Cambridge: The University Press
  9. S2CID 119326088
  10. Robertson, Edmund F., "Jost Bürgi (1552 – 1632)", MacTutor History of Mathematics Archive, University of St Andrews
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