Difference between revisions of "Documentation/FAQ/Formula"

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m (When I enter 3xy the number 3 comes out in italics. Is this a bug?)
(I enter x^* to typeset x*, but get an error message. Why?)
 
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==I enter <font color="brown">'''x^*'''</font> to typeset x<SUP>*</SUP>, but get an error message. Why?==
 
 
The problem is that<font color="brown">''' * '''</font>is a binary operator, that is
 
there has to be an expression on both sides of the symbol.
 
 
You either have to enter the expression<font color="brown">''' x^{{}*{}} '''</font>to avoid the
 
error message, or you could type <font color="brown">''' x^"*"'''</font> as well, where the quotes
 
will interpret the asterisk not as a binary operator but as a "standalone" symbol.
 
 
If you use this construction a lot you might want to define the
 
symbol as an user defined symbol. See [[FAQ:Formula#I_need_a_symbol_that_Math_does_not_provide._What_can_I_do.3F|I need a symbol that Math does not provide. What can I do?]].
 
If you have defined the * as an user defined symbol, say<font color="brown">''' %ast'''</font>,
 
you can enter<font color="brown">''' x^%ast'''</font>.
 
 
This answer applies to a lot of other symbols as well. Some operators, such as +, are unary, that is there only has to be an expression to the right of the symbol. To typeset x<SUP>+</SUP> you can enter<font color="brown">''' x^{+{}}<'''</font> or, of course, <font color="brown">'''x^"+"'''</font>.
 
 
==When I enter one of the symbols '''<font color="brown">#</font>,<font color="brown"> &amp;</font> ,<font color="brown">|</font>,<font color="brown">^</font>''' or <font color="brown">'''_'''</font> I get an unexpected result or an error message. How can I use these symbols?==
 
 
These symbols all have a special meaning in ''Math'':
 
 
*The symbol<font color="brown">''' # '''</font>is used in stacks and matrices.
 
*The symbols<font color="brown">''' &amp; '''</font>and<font color="brown">''' | '''</font>are used for logical and logical or.
 
*The symbols<font color="brown">''' ^ '''</font>and<font color="brown">''' _ '''</font>are used for subscripts and superscripts.
 
 
To use them in your formula you can put them in quotation marks,
 
which means that you insert them as text.
 
 
If you want to use the symbol &quot;|&quot; you should consider
 
whether the construction you need is one of the the following:
 
 
*<font color="brown">'''a divides b '''</font>is used to typeset a| b.
 
*<font color="brown">'''abs a '''</font>is used to typeset |a|.
 
 
==I want to use a binary operator (like <font color="brown">'''union'''</font> or<font color="brown"> '''otimes'''</font>) as a large operator (like <font color="brown">'''int'''</font> or <font color="brown">'''sum'''</font>). How can I do that?==
 
 
You have to define the symbol you want to use as a user-defined
 
symbol first. See <A HREF="012.html">FAQ #012</A> for instructions;
 
most of the symbols used by ''Math'' are part of the StarMath
 
font.
 
 
Let's say you have defined the union symbol as the user-defined
 
symbol <font color="brown">'''%union'''</font>. You can then enter for example
 
 
<pre>oper%union from i in I A_i</pre>
 
 
in order to typeset the formula
 
 
[[Image:006a.gif]]
 
 
<em>Note</em>: In build 633 this doesn't work if there is a space before
 
<font color="brown">'''%union'''</font> (this is a bug in the parser).
 
<P>Any user-defined symbol can be used as a large operator if it is
 
preceded with<font color="brown">''' oper '''</font>as in the example.</P>
 
  
  
 
[[Category: Documentation/FAQ]]
 
[[Category: Documentation/FAQ]]
 
[[Category:User FAQ]]
 
[[Category:User FAQ]]

Latest revision as of 13:12, 8 October 2021

doc OOo


Documentation note.png A useful first resource is the OpenOffice Math Syntax Reference.

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