I have the following commandenter image description here

How to circonvent this weird comportment. Perhaps, it is not possible to open a pdf file from mathematica. But this is not the full problem.

  • $\begingroup$ Why did't you use string for the url? $\endgroup$ – vapor Sep 30 '16 at 4:29
  • $\begingroup$ Because the output open nothing $\endgroup$ – cyrille.piatecki Sep 30 '16 at 4:36
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    $\begingroup$ The url must start with http://. Then -1 for posting a picture rather than code text. I'll retract the downvote after you post the code. $\endgroup$ – xzczd Sep 30 '16 at 5:18
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    $\begingroup$ @cyrille.piatecki If it doesn't start with http:// then it starts with another protocol like ftp://, sftp://, https://... there is no URL that doesn't start with a protocol as in your image. (Your browser may be forgiving however, and assume the protocol if it's missing.) $\endgroup$ – C. E. Sep 30 '16 at 8:20
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    $\begingroup$ The severe lack of effort put forward in this question is why I downvoted. If you can't even bother to finish the title of question.. $\endgroup$ – chuy Sep 30 '16 at 13:43
"http://coco-m.web.lynchburg.edu/multiplicative calculus.pdf"]

Evaluate the link, then click on description.

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