Difference between revisions of "Command/startformula"
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m (Text replace  "Reference/en" to "Commands") 
m (moved Reference/en/startformula to Command/startformula: Text replace  "Reference/en/" to "Command/") 
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Revision as of 03:31, 14 March 2012
\startformula
Syntax
\startformula ... \stopformula 
Description
comment
Note: these are defined by the following lines in strcmat.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 $(ab) =0$, where the scalar product
$(\cdot\cdot)$ on ${\Bbb R}^n$ is defined to be
\startformula
(ab) := a\cdot b =\sum_{j=1}^{n}a_jb_j, \qquad a^2 := (aa).
\stopformula
(Note that the above equation is {\it not\/} numbered).
\stoptext