Belief revision
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 language is defined by a context free grammar, together with operator precedence and operator associativity rules. 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. The GNU implementation extends the original language by adding a number of new keywords such as smallover and accent. mandoc, a specialised compiler for UNIX man pages, also contains a standalone eqn parser/formatter.
Syntax examples
Here is how some examples[1] would be written in eqn (with equivalents in TeX for comparison):
| TeX | eqn | formula |
|---|---|---|
| Dancer or Choreographer Broadbent from Wrigley, spends time with interests like 4 wheeling, property developers in singapore and aerobics. Likes to see new condos in singapore towns and locales like Vatican City. | a sup 2 | |
| Dancer or Choreographer Broadbent from Wrigley, spends time with interests like 4 wheeling, property developers in singapore and aerobics. Likes to see new condos in singapore towns and locales like Vatican City. | sum from { k = 1 } to N { k sup 2 } | |
$ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} $
|
x={-b +- sqrt{b sup 2 – 4ac}} over 2a |
Spaces are important in eqn; tokens are delimited by whitespace characters, tildes ~, braces {} and double-quotes "" only. Thus f(pi r sup 2) results in whereas f( pi r sup 2 ) is needed to give the intended .
See also
Notes
References
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A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
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