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| − | There are several built-in commands for displaying mathematical formulas. For instance
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| − | <pre>
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| − | \startcases, \stopcases
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| − | \startmathmatrix, \stopmathmatrix
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| − | \startalign,\stopalign
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| − | </pre>
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| − | Each has its own advantage and can be customized: for a thorough understanding of these commands please refer to Aditya Mohajan's excellent user's guide
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| − | [http://dl.contextgarden.net/myway/mathalign.pdf Using \startalign and friends]. These commands can be found in [[source:core-mat.tex|core-mat.tex]] file, which contains most of the core ConTeXt math macros.
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| − | <pre>
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| − | \starttext
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| − | This is an example of aligned equations:
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| − | \startformula
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| − | \startcases[align={right,left},distance=3pt]
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| − | \NC 2x + 3y \NC{} = 10 \NR
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| − | \NC 3x + 2y \NC{} = 5, \NR
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| − | \stopcases
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| − | \stopformula
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| − | and this is another one:
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| − | \startformula
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| − | \startmatrix[align={right,left},distance=3pt,left={\left\{}, right={\right.}]
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| − | \NC 2x + 3y \NC{} = 10 \NR
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| − | \NC 3x + 2y \NC{} = 5 \NR
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| − | \stopmatrix
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| − | \stopformula
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| − | In these structures it is important to notice that the sign \type{=} is preceded by \type{\NC{}}, since
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| − | otherwise that sign would be considered as a binary operator and the alignment would be
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| − | disturbed (at least this is what I guess…Otared K.).
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| − | \stoptext
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| − | </pre>
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| − | One of the powerful structures in displaying mathematical formulas is the possibility of defining custom maths alignment.
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| − | For instance the following definition
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| − | <pre>
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| − | \definemathmatrix[alignedcases]
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| − | [align={right,left,left},
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| − | distance=3pt,
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| − | left={\left\{},
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| − | right={\right.},
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| − | style=\displaystyle]
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| − | </pre>
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| − | creates two new commands,
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| − | <pre>
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| − | \startalignedcases, \stopalignedcases:
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| − | </pre>
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| − | after which one may use them in a displayed formula as follows:
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| − | <pre>
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| − | \starttext
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| − | The following formula is displayed in two lines with an appropriate alignment of the equations:
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| − | \startformula
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| − | \startalignedcases
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| − | \NC -\Delta u + g(u) \NC{} = f \NC \quad\mbox{in } \Omega\NR
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| − | \NC {\partial u \over \partial {\bf n} } \NC{} = h(u) \NC \quad\mbox{on } \partial\Omega \NR
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| − | \stopalignedcases
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| − | \stopformula
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| − |
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| − | \stoptext
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| − | </pre>
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