Eqn

Eqn

Part of the troff suite of Unix document layout tools, eqn is a preprocessor that formats equations for printing. A similar program, neqn, accepted the same input as eqn, but produced output tuned to look better in nroff. The eqn program was created in 1974 by Brian Kernighan and Lorinda Cherry.

The input language used by eqn allows the user to write mathematical expressions in much the same way as they would be spoken aloud. The eqn language is similar to the mathematical component of TeX, which appeared several years later, but is simpler and less complete.

An independent compatible implementation of the eqn preprocessor has been developed by GNU as part of groff, the GNU version of troff.

Syntax examples

Here is how some of the examples from [http://meta.wikimedia.org/wiki/Help:Formula] would be written in eqn (with equivalents in TeX for comparison):

See also

*troff

References

*Brian W. Kernighan and Lorinda L. Cherry. "A System for Typesetting Mathematics", Communications of the ACM 18 (1975), 151–157.

External links

* [http://www.kohala.com/start/troff/v7man/eqn/eqn2e.ps Typesetting Mathematics, User's Guide (Second Edition)]
* [http://www.uwm.edu/cgi-bin/IMT/wwwman?topic=neqn(1)&msection= UNIX man page for neqn(1)]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • EQN — Equation (Academic & Science » Meteorology) Equation (Academic & Science » Chemistry) Equation (Academic & Science » Universities) Equation (Governmental » Transportation) Equation (Academic & Science » Ocean Science) **** Equation (Governmental… …   Abbreviations dictionary

  • eqn — abbr. equation …   Dictionary of English abbreviation

  • EQN — eques numeri …   Abbreviations in Latin Inscriptions

  • EQN — abbr. equation …   Dictionary of abbreviations

  • eqn — math. abbr. Equation …   United dictionary of abbreviations and acronyms

  • MAX-3LIN-EQN — is a problem in Computational complexity theory where the input is a system of linear equations (modulo 2). Each equation contains at most 3 variables. The problem is to find an assignment to the variables that satisfies the maximum number of… …   Wikipedia

  • Cash accumulation equation — The cash accumulation equation is an equation which calculates how much money will be in a bank account, at any point in time. The account pays interest, and is being fed a steady trickle of money. Compound interest We will approach the… …   Wikipedia

  • Fourier optics — is the study of classical optics using techniques involving Fourier transforms and can be seen as an extension of the Huygens Fresnel principle. The underlying theorem that light waves can be described as made up of sinusoidal waves, in a manner… …   Wikipedia

  • Birefringence — Displacement of light rays with perpendicular polarization through a birefringent material …   Wikipedia

  • Time-of-flight mass spectrometry — (TOFMS) is a method of mass spectrometry in which ions are accelerated by an electric field of known strength. [Stephens, W. E., [http://link.aps.org/abstract/PR/v69/p674/s2 A Pulsed Mass Spectrometer with Time Dispersion] Phys. Rev. , 1946, 69 …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”