What type of parameters do I need to change in the draw function if I want to get an arrow-like below (see Picture) between my nodes?

enter image description here

  • 1
    pgf-manual, arrow shapes, arrow tip
    – MS-SPO
    Jun 16 at 18:02

1 Answer 1


every node/.style = {draw, minimum size=2em},
       alr/.style = {{Implies[]}-{Implies[]}}
\node                   (A) {$S$};
\node   [right=of A]    (B) {$A$};
\draw[double, alr] (A) -- (B);

enter image description here

For explanation see TikZ & PGF manual, Arrow Tip Kind Implies, on page 216.

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