! Package inputenc Error: Unicode char Δ (U+394)
! Package inputenc Error: Unicode char Δ (U+394)
I would like to set up a bibliography containing greek letters e.g. but receive an error while printing my bibliography. Though having read several questions related to that topic e.g. 1, 2 and 3 I am not able to find my error. I understand that it is linked to the encoding of my bibliography, since the error shows up only if I print my bibliography. Am I missing any additional options for biblatex I exported my bibliography via Zotero as a BibLateX file using UTF8-Coding. I am using Texmaker editor which uses UTF8 encoding as well. MWE beginfilecontentsreferences.bib this article is fine articlestuiver_modeling_1993, title Modeling Atmospheric 14C Influences and 14C Ages of Marine Samples to 10,000 BC, author Stuiver, Minze and Braziunas, Thomas F., date 1993, this article creates headache due to the greek capital delta in the title articledutta_r_2001, title R Correction Values for the Northern Indian Ocean, author Dutta, Koushik and Bhushan, Ravi and Somayajulu, B. L. K., date 2001 endfilecontents documentclassarticle usepackageT1fontenc usepackageutf8inputenc usepackagebackendbiberbiblatex addbibresourcereferences.bib begindocument Test first textcitebard_radiocarbon_2013 and second textcitedutta_r_2001 Error shows up only if I add the bibliography printbibliography enddocument The error message copied from the .log file: Package biblatex Info: Input encoding utf8 detected. Package biblatex Info: Automatic encoding selection. biblatex Assuming data encoding utf8. openout3 test.bcf. Package biblatex Info: Trying to load bibliographic data... Package biblatex Info: ... file test.bbl found. .test.bbl Package biblatex Info: Reference section0 on input line 40. Package biblatex Info: Reference segment0 on input line 40. LaTeX Font Info: Try loading font information for T1cmtt on input line 43. usrsharetexlivetexmf-disttexlatexbaset1cmtt.fd File: t1cmtt.fd 20140929 v2.5h Standard LaTeX font definitions LaTeX Font Info: External font cmex10 loaded for size Font 7 on input line 43. LaTeX Font Info: External font cmex10 loaded for size Font 5 on input line 43. Package inputenc Error: Unicode char U394 inputenc not set up for use with LaTeX. See the inputenc package documentation for explanation. Type H return for immediate help. Workarounds: As pointed out in the comment there are two quick workarounds: Edit your .bib file. In my particular case replace R by Delta R in the .bib file. Use DeclareUnicodeCharacter394Delta in the preamble of your .tex document. However, solution 1 is not useful if you are regularly updating your .bib file as you have to replace the characters each time by hand. Solution 2 is much more time-saving, but I still would like two know the source of my error. Apparently, the complete character list for UFT-8 includes also GREEK CAPITAL LETTER DELTA U0394. So why do I get the error message although all encoding is set up for uft8
A similar problem occurs with documentclassarticle usepackageT1fontenc usepackageutf8inputenc begindocument enddocument when compiled with pdfLaTeX. It is a slightly annoying for some fact that inputencs UTF-8 config file does not set up all Unicode characters for use with LaTeX. One of the reasons being that fonts in LaTeX contain significantly fewer code points than Unicode and it is not always possible to predict where the glyph resides if it is present at all. So as noted in the comments, DeclareUnicodeCharacter0394Delta or DeclareUnicodeCharacter0394ensuremathDelta would be a solution to your problem. The latter has the advantage that it works in text and math mode, while Delta will fail if TeX is already in math mode, i.e. with input such as R thanks to egreg for pointing this out in the comments. The alternative solution of writing title DeltamathrmR Correction Values for the Northern Indian Ocean, is what I would prefer here, but I dont know about the conventions in your field, maybe the R should be upright, ... The software you use to export your .bib file should let you use TeXs math mode, so that you wont have to manually edit your .bib file all the time. Alternatively, you can use of the engines that support Unicode natively, XeLaTeX or LuaLaTeX. With those engines you wont need DeclareUnicodeCharacter because they can access system fonts directly where LaTeXs character limit does not come into play.
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