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When I try to export Greek characters from Mathematica to a pdf file, the pdf is filled with unknown characters. Please note that i have no idea about Mathematica, I have just installed it today. I am trying to export as plain text.

P.S. I have already seen this Copying Greek text from notebooks as unicode.

Edit: My operating system is windows 7, I am using 'Save as...' in order to export. Please try this one for example:

1.Έχουμε u + v + w + z = 6 και u + w + z = 4 και u + w = 2.Χρησιμοποιώντας την μέθοδο της αντικατάστασης βρίσμουμε οτι v+4=6 v=2 και  z+2=4  z=2 και u+w=2.Επομένως η τομή των τριών επιπέδων θα είναι η ευθεία u+w=2.Έαν γνωρίζαμε οτι u=-1,τοτε θα είχαμε w-1=2w=3.Επομένως η τομή θα ήταν το σημείο (u,v,w,z)=(-1,2,3,2)

Update1: Using

SetOptions[$FrontEnd, CharacterEncoding -> "UTF8"]; Export["test.pdf", "Text"]

seems to fix the problem, but the output pdf have grey background like for example this pdf output. Do you guys know a way to make it like this pdf? (second pdf has an issue with spaces between words, and was exported using 'Save as...')

Update2: Thanks everyone, I have found a solution to my problem. Changing character encoding works for me.

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closed as off-topic by Michael E2, rasher, m_goldberg, Sjoerd C. de Vries, Kuba Jul 5 at 20:49

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could you give an example? it works here. how do you export? with Export, with save as, or some other way? –  acl Mar 21 '13 at 2:36
If you've got a Mac, just select File > Print from the menu's, then click 'Save as pdf'. Job done. –  zentient Mar 21 '13 at 5:42
if I just past all that into a text cell and save as pdf, it's fine (on os x). –  acl Mar 21 '13 at 11:02
Perhaps you could provide the final solution as an answer below? Self-answering is perfectly ok. –  Sjoerd C. de Vries Mar 22 '13 at 6:12
This question should be put on hold because the answer is given in the question and the OP has not visited site in over a year. –  Michael E2 Jul 5 at 19:12