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4_domaines_specialises:mathematiques:arguments_contre_eqnarray2 [2018/06/02 17:37]
joseph.wright
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---- 
-title: Why not use `eqnarray`? 
-category: usage 
-permalink: /​FAQ-eqnarray 
-date: 2014-06-10 
---- 
- 
-The environment `eqnarray` is attractive for the 
-occasional user of mathematics in LaTeX documents: it seems to 
-allow aligned systems of equations. ​ Indeed it _does_ supply such 
-things, but it makes a serious mess of spacing. ​ In the system: 
-```latex 
-\begin{eqnarray} 
-  a & = & b + c \\ 
-  x & = & y - z 
-\end{eqnarray} 
-``` 
-the spacing around the ''​=''​ signs is _not_ that defined in the 
-metrics for the font from which the glyph comes&​nbsp;&​mdash;​ it's 
-`\arraycolsep`,​ which may be set to some very odd value for reasons 
-associated with real arrays elsewhere in the document. 
- 
-The user is far better served by the AMSLaTeX bundle, which 
-provides an `align` environment,​ which is designed with 
-the needs of mathematicians in mind (as opposed to the convenience of 
-LaTeX programmers). ​ For this simple case (`align` and 
-other AMSLaTeX alignment environments are capable of far greater 
-things), code as: 
-```latex 
-\begin{align} 
-  a & = b + c \\ 
-  x & = y - z 
-\end{align} 
-``` 
-The matter is discussed in more detail in a  
-[PracTeX journal paper](https://​tug.org/​pracjourn/​2006-4/​madsen/​madsen.pdf) 
-by Lars Madsen; Stefan Kottwitz offers a  
-[TeX blog entry](http://​texblog.net/​latex-archive/​maths/​eqnarray-align-environment/​) 
-which includes screen shots of the output, convincingly demonstrating 
-the problem. 
- 
  
4_domaines_specialises/mathematiques/arguments_contre_eqnarray2.1527953840.txt.gz · Dernière modification: 2018/06/02 17:37 par joseph.wright
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