MathJax
MathJax is software for typing formulas [1]. It uses the Latex style, making the source of the web-article compatible with style of a scientific journal.
Dollar
In MathJax, as in Latex, many things are controlled by dollars. Typing the sign of dollar, id est, $ \$ $, switches on the mathematics mode; then, the characters are interpreted as mathematical symbols or as the Latex commands. If the dollar appears again, it switches the control back to the normal typesetting. In such a way, to type some math and then some plain text, one needs at least two dollars. The results may look like this: $\int_a^b f(x)\mathrm d x$.
Typing two dollars at once, id est, $ \$ \$ $, reserves the special line for the equation. After to finish this equation, the double-dollar should be repeated again. The result may look as this: $$\int_a^b f(x)\mathrm d x$$
nomathjax
In Wo, MathJax is supported by default. It can be desactivated with command nomathjax, just type $<\! \rm nomathjax \!>$.
After such a command, the dollars loss their usual value [2] and are interpreted as ordinary characters; they can be typed in any amount without any special effect. In such a way, you may print so many dollars as you need.
Then the MathJax can be activated again with command $<\! \rm /nomathjax \!>$.
After such a command, the dollars get back their normal meaning and ability to switch-on and switch-off the math mode.
Temporal suppressing of MathJax is essential at the including of some code in Latex and/or in PHP, where dollars are important.
Numbering of formulas
The similarity with Latex appears in the numbering of formulas. The test of equation references is suggested at http://cdn.mathjax.org/mathjax/latest/test/sample-eqrefs.html [3]. Similar examples are shown below.
Here is a labeled equation: $$f_1(x)=\frac{x+1}{\sqrt{1-x^2}}\label{ref1}$$ it is labeled as "ref1", and here is reference to ref1: \ref{ref1}.
In the similar way, one may label another equation, $$f_2(x)={x+2\over\sqrt{1-x^2}}\label{ref2}$$ it is labeled as "ref2", and here is reference to ref2: \ref{ref2}. The equations should be referred one by one, for example, \ref{ref1}, \ref{ref2}. Attempts to cite them both at once is interpreted as an error \ref{ref1,ref2}, and marked with red.
References
- ↑ 1.0 1.1 http://www.mathjax.org/ MathJax is an open source JavaScript display engine for mathematics that works in all modern browsers.
- ↑ With command $<\! \rm nomathjax \!>$, one can easy refute the widely spread concept "Dollar is always Dollar, even in Africa!"
- ↑ http://cdn.mathjax.org/mathjax/latest/test/sample-eqrefs.html A test of Equation References.