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| <h3>I enter <KBD>x^*</KBD> to typeset x<SUP>*</SUP>, |
| but get an error message. Why?</h3> |
| <P>The problem is that<KBD> * </KBD>is a binary operator, that is |
| there has to be an expression on both sides of the symbol.</P> |
| <P>You either have to enter the expression<KBD> x^{{}*{}} </KBD>to avoid the |
| error message, or you could type <kbd> x^"*"</kbd> as well, where the quotes |
| will interprete the asterisk not as a binary operator but as a "standalone" symbol.</P> |
| <P>If you use this construction a lot you might want to define the |
| symbol as a userdefined symbol. See <A HREF="012.html">FAQ #012</A>. |
| If you have defined the * as a userdefined symbol, say<KBD> %ast</KBD>, |
| you can enter<KBD> x^%ast</KBD>.</P> |
| <P>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<KBD> x^{+{}}</KBD> or, of course, <kbd>x^"+"</kbd>.</P> |
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