Difference between revisions of "Command/startformula"

From ConTeXt wiki
Jump to navigationJump to search
m (Text replace - "== Help from ConTeXt-Forum ==" to "== Help from ConTeXt-Mailinglist/Forum ==")
m (Text replace - "Category:(.*)" to "Category:Command/$1")
Line 62: Line 62:
 
{{Forum|{{SUBPAGENAME}}}}
 
{{Forum|{{SUBPAGENAME}}}}
  
[[Category:Mathematics|startformula]]
+
[[Category:Command/Mathematics|startformula]]

Revision as of 21:48, 20 March 2012

\startformula

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

Help from ConTeXt-Mailinglist/Forum

All issues with: