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I am new to latex. I need to write the following equation in latex.
I have tried following packages:-
\usepackage{amssymb}
\usepackage{amsmath}
L1 \cap Li \neq \Phi
But i constantly get error and non of the symbols gets displayed. what am i doing wrong. (i am using XeLatex as there are both English and urdu Fonts in my article)
It works for me if I complete your code to create a minimal example:
\documentclass{article}
\usepackage{amssymb}
\usepackage{amsmath}
\begin{document}
\[
L1 \cap Li \neq \Phi
\]
\end{document}
Admittedly, this isn't yet quite right because it does not look quite like the target set of symbols.
To obtain a subscript in a mathematical expression, just use L_{<subscript>}. To obtain the lowercase Greek letter, use \phi rather than \Phi.
\[
L_1 \cap L_i \neq \phi
\]
In light of Heiko Oberdiek's comment, for the final symbol, I'm not entirely clear which one you want but I suspect that Heiko may be right. In any case, here's a selection to choose from:
\[
\phi \Phi \varphi \emptyset \varnothing
\]
Not a direct answer but I have always found this to be exceedingly useful when creating complex equations or text with extraordinary symbols.
[http://www.ctan.org/tex-archive/info/symbols/comprehensive/[1]
\[...\]$ ... $around your equation, or\( ... \). Try$\mathbf{L}_{1} \cap \mathbf{L}_{i} \neq \mathbf{\Phi}$\[ ... \]will also work, although that will enter a displayed maths environment. Use\[ ... \]for displayed maths and$ ... $or\( ... \)for in-line maths\Phiis probably quite wrong and the symbol means the empty set instead.