# Difference between revisions of "Command/startformula"

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== [[Help:Reference|Syntax]] == | == [[Help:Reference|Syntax]] == | ||

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== Example == | == Example == | ||

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(Note that the above equation is {\it not\/} numbered). | (Note that the above equation is {\it not\/} numbered). | ||

\stoptext | \stoptext | ||

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== See also == | == See also == |

## Latest revision as of 00:26, 15 November 2019

# \startformula

## Syntax (autogenerated)

\startformula[...,...] ... \stopformula | |

[...,...] | packed tight middle frame depth line halfline -line -halfline inherits from \setupbodyfont |

\startformula[...=...,...] ... \stopformula | |

option | packed tight middle frame depth line halfline -line -halfline see \setupbodyfont |

margin | yes no standard dimension |

grid | see \snaptogrid |

## Syntax

\startformula ... \stopformula |

## Description

## comment

Note: these are defined by the following lines in strc-mat.mkiv:

\setvalue{\e!start\v!formula}{\dostartformula{}} \setvalue{\e!stop \v!formula}{\dostopformula}

## Example

\starttext This is the first mathematical formula \placeformula[First] \startformula \sin^2(t)^2 + \cos^2(t) = 1. \stopformula This is another formula \placeformula[eqn:tangent] \startformula \cos^2(t) = \frac{1}{1+\tan^2(t)}. \stopformula As one may see from relation~(\in[eqn:tangent]), $\cos(t)$ and $\sin(t)$ can be determined by $\tan(t)$\dots This is the third formula \placeformula[Pythagora] \startformula |a+b|^2 = |a|^2 + |b|^2 \stopformula Clearly equality (\in[Pythagora]) holds for $a,b \in {\Bbb R}^n$ if and only if $(a|b) =0$, where the scalar product $(\cdot|\cdot)$ on ${\Bbb R}^n$ is defined to be \startformula (a|b) := a\cdot b =\sum_{j=1}^{n}a_jb_j, \qquad |a|^2 := (a|a). \stopformula (Note that the above equation is {\it not\/} numbered). \stoptext

## See also

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