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I did'n find a way to draw two different arrows (from the arrows tikz library) between two nodes ... For example, -triangle 45 at one extremity and -open triangle 90 at the other extremity. Any idea about how to do that ?

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Simply place the specifications at either side of the -: open triangle 90-triangle 45, as in:



\node (a) {A};
\node (b) at (2,0) {B};
\draw[open triangle 90-triangle 45] (a) -- (b);

arrows at either end

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Hum ... thanks ! and sorry for this naive question. – user7137 Aug 8 '11 at 15:38
@user7137: No need to apologise! That's what this site is for: things that are easy for one are tricky for another. – Loop Space Aug 8 '11 at 19:31

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