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$\begingroup$

I have a simple equation which looks like that except that there placed vector signs there are straight horizontal lines: \begin{equation} \ z = i^8 + \overline{z_1} \cdot \overline{z_1} -z_1 ;\\ \ z_1 = 2-3i , \\ \ z_2 = 1+i \end{equation}

What does these horizontal lines means?

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    [Complex conjugate](http://en.wikipedia.org/wiki/Complex_conjugate)2012-02-19

2 Answers 2

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Complex conjugate. ${}{}{}{}{}$

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In fact I do not see horizontal line but vector arrow. This kind of arrow means that variable is a vector but taking in account that those variables are complex numbers Gerry Myerson may be right that this is complex conjugate and there should be horizontal line instead of arrow.

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    It looks this forum supports reasonable big subset of latex symbols so you could use \overline{d} command. I have edided your question accordingly but you must accept my edit if you want change to be visible.2012-02-19