Text you can write in more than one row:
\begin {array} text\\nextline\\ third line \end {array}. If You want several columns, write: \begin {array} f(x)=&(x+2)^2\\&&=x^2+4x+4 \end {array} For a matrix or a determinant you need brackets too. With \left and \right they will come automatically in the appropiate size: \left( \right| \left\( \left\| \right\langle. \left( \begin {array} 3&7&6.4\\ &&-10\\ 2&0&7 \end {array} \right) In place of {array} you can use the words:{matrix}, {eqnarray},{center}, {left}and {right} as well. 2D-vectors you can write short: (_3^4) or better:{3 \choose 4}
In the first row of the array of symbols you find the operating symbols: Type: ^3 and Type:\hat 3. The symbols ^and _ You can combine for different results:9^^2_ _s. Try \sum _{x=1}^\infty \lim _{n \to \infty} \int_0^{25} f(n)=\left\{ \begin {matrix} n&if&n&is&even\\1&else \end {matrix}
What Tex don't understand, will be ignored.
Look at these symbols too: \asymp \natural \dagger \ddagger \dashv \doteq \top \unlhd \unrhd \fbox \odot \ominus \oplus \oslash \otimes \udot \minus \uplus \uslash \utimes \sharp \star \ldots \cdots \mp \diamondsuit \spadesuit \heartsuit \clubsuit \prec \preceq \propto \succ \succeq \flat \prime \aleph Different dots: \dot a \ddot u \cdot \cdots \vdots \ddots \ldots \rdots Different arrows: \downarrow \Uparrow \Updownarrow \nearrow (=North-East-Arrow) \nwarrow \swarrow \searrow \hookleftarrow Try these: \widehat {4mO} \widetilde \underline \overbrace Different spacing: a\!b ab a\,b a\quad b a\qquad b Different size: \in and \epsilon \ast (asterix) \setminus \qquad \triangleleft \triangleright \diamond \emptyset Different form: \varphi \varpi \varepsilon \varrho \varsigma \vartheta \hbar \nu \wr \wp \sqcup \sqcap \sqsubset \sqsupseteq \Im \Re \imath \jmath and finally you might \frown or \smile.
If You use this TEX-tool to display inside an applet, differ between text and numbers. Format the numbers. If a=-3, then \sum ^a and \sum ^{a} will be different.


 Most simple is to write mathematics in words, for example:
  Integral from x equals zero up to x equals infinity from ...
 It's just like reading a text to a blind person.

 Simple is to use a paint-programm, You can type and draw, whatever
 Your hand allows - especially with a graphic tablet. And then You 
 can insert the picture into a office- or word-programm.
 A tip:when You open any simple gif-file, than You can save every creation
 also as gif-file.
 If You want to type mathe, You find - well hidden - in the 
 Easy Java Simulations from Francisco Esquembre
 a small bar to edit TEX, hang this in Your Write-programm or Editor.
 With a screencopy-programm like  hardcopy by Siegfried WeckmannYou 
 just hit the scroll-key and You can select Your notations. 
 Right-click and paste (and resize).
 For HTML You insert into a paint-programm and save it into the folder
 of Your choice, as gif, jpeg or -sometimes png.
 (Tex-string is in EJS:Simulations\_examples\_MinorExamples\basic\EquationExample.xml)
 If You use a sandbox, like finjan-safe-zone, don't forget to disable it.


 Read above about writing or typing with Tex-string and inserting pictures
 (of formulas) into a html-file.
 Html has it's own possibilities too:
  You can write things like 3 4 and indexes with the tag sup or sub:
   3[sup]4[/sup]  or x [sub] i [/sub]  (of course with the hook-brackets in
                                        place of [  ] )

  For vectors, matrices and arrays:
   Start with [pre] and write the text, just as you want to have it displayed
   and end with [/pre].
   Or use the tabletag to create bordered vectors and matrices.

  If You use an office or word-programm, which can save the text as html, it's nice 
  - but not all people on the net will be able to see, what You wrote. But- 
  when You open the source-code in an editor, You can simplify it to Your needs.

  This symbol (GmbH and Co) can not be shown in a website
   like this in html. When You type this symbol, it will be shown as:    &  .
  But & should be inside html-source code written like this
  You create  with a paint-programm a gif-picture of this size and save it in
  the same folder as Your html-text.
  So I've done some more symbols for You.

More about writing html you can find under selfhtml von Stefan Münz.

The font of symbols you can use is limted. A tool for editing these:

HTML-Formelwerkzeug von Petra Oberhuemer und Franz Embacher