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Using amsmath and extarrows packages, we have many extensible arrows. But these arrows look ugly, since some parts in an arrow are boldfaced.

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Are there any better-looking extensible arrows?

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They are not really bold, just overlapping slightly which affects the anti-aliasing in low resolution. They should print OK. tikz or pstricks or xypick can all draw arrows instead of using repeated character segments, which may suit you better –  David Carlisle Oct 7 '13 at 8:52
    
@DavidCarlisle The overlapping makes arrows look ugly when reading document in computer. Why overlapping is necessary in these extensible arrows? I notice that in xypic, long arrows look better than these. –  Z.H. Oct 7 '13 at 9:03
    
@DavidCarlisle But how to use an arrow drawn by tikz or xypic as an operater inside a math formula? It seems not easy. –  Z.H. Oct 7 '13 at 9:14

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