# How to write plain Greek in a text cell

If I create a text cell and type some greek text, most of the symbols are italics as if the cell had an Input style. It doesn't happen with latin characters. I recollect that it is impossible to fix it, but I can't find the source where I read it.

Perhaps someone knows a workaround ? The following screenshot is from Mathematica 8/Linux.

EDIT1: I just noticed that writing capital greek letters works fine (the letters are normal, not italics). The following screenshot is from Mathematica 9.0.1/OSX Mavericks.

Does that piece of information ring any bells to anyone on what might be the underlying problem ?

EDIT2: I also found this link describing a workaround by using custom modified unicode mapping files. I can't check it right now as I'm not near my Linux installation.

EDIT3: I did try it though in Mathematica 9.0.1/OSX (although the article talks about Mathematica 7&8/Linux), and it works great! Here is the relevant screenshot:

EDIT4: As pointed out by @ybeltukov in comments, the workaround is to set the third column of UnicodeFontMapping.tr to 0 (zero) for Greek letters so that the default font is picked for them.

EDIT5: This workaround doesn't anymore apply to Mathematica 10. I cannot find the UnicodeFontMapping.tr file.

-
related –  cormullion Sep 20 '13 at 10:34
Similar question posted on Wolfram Community –  cormullion Sep 22 '13 at 8:40
Explanation of your last link: just set the third column of UnicodeFontMapping.tr to 0 for greek letters to choose the default font for them. –  ybeltukov Nov 1 '13 at 21:13
People, is it ethical to answer my own question that I put a bounty on ? –  Zet Nov 1 '13 at 21:13
Related for version 10: (54721) –  Mr.Wizard Aug 20 at 3:11

Font for the Greek letters is defined in UnicodeFontMapping.tr:

...
0x03B1      N       -2      0x61        # \[Alpha]
0x03B2      N       -2      0x62        # \[Beta]
0x03B3      N       -2      0x67        # \[Gamma]
0x03B4      N       -2      0x64        # \[Delta]
0x03F5      N       2       0x65        # \[Epsilon]
0x03B5      N       -4      0xb6        # \[CurlyEpsilon]
0x03B6      N       -2      0x7a        # \[Zeta]
...


The third column defines the font. You can set it in corresponding lines to 0 (default font).

This approach was used in your link. Difference between the original file and the file in this link:

--- UnicodeFontMapping.tr       2012-10-26 12:11:10.000000000 +0200
+++ UnicodeFontMapping.tr.v8    2013-11-01 22:09:05.000000000 +0100
...
-0x03B1         N               -2              0x61            # \[Alpha]
-0x03B2         N               -2              0x62            # \[Beta]
-0x03B3         N               -2              0x67            # \[Gamma]
...
+0x03B1         N               0               0x61            # \[Alpha]
+0x03B2         N               0               0x62            # \[Beta]
+0x03B3         N               0               0x67            # \[Gamma]
...

-

For OS X Mathematica v10, one can edit /Applications/Mathematica.app/FontMap.tr to enable writing Greek letters in any font supporting them. In my case, I wanted µ (\[Micro]) to display with my preferred font (CMU Bright Roman) rather than the Mathematica font. The solution was to open FontMap.tr, copy the string within CompressedData[str], paste it into fontMap=Uncompress[str] in a new workbook, delete 181 (character code for \[Micro]) at position 32 of fontMap[[1,2]] by running fontMap[[1,2]]=Drop[fontMap[[1,2]],{32,32}], recompress by running Compress[fontMap], copy the resulting compressed string, past it over the original string within CompressedData[str] of FontMap.tr and then save FontMap.tr. I kept a backup of the original FontMap.tr file. Now Style["µ", FontFamily -> "CMU Bright"] displays µ with my chosen font.

I suppose this could be done for other Greek letters as well.

-
Thanks @DBM! So, I should delete all character codes for Greek letters in the font map and then use Style[] to choose a Greek font ? –  Zet Aug 25 at 21:19
I think that should work, but have not tried this on more than one greek letter. Keep a backup of the original FontMap.tr file... –  DBM Aug 26 at 5:13