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My bib file contains (the most famous book)

@book {Gohberg-Krein*69, AUTHOR = {Gohberg, I. C. and Kre{\u \i}n, M. G.},}

I'm using a usual amsart class and biblatex set with Biber and UTF-8. And my preamble has the command

\DeclareUnicodeCharacter{0306}{{\u \i}}

The result is something like: "Kre\i{\u\i}n". So a first i without dot is issued, then the proper {\u\i}.

Would anyone how to cure that? I understand next to nothing on encodings :/ Many thanks in advance!

David Carlisle
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Olivier Ramaré
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  • If you prefer using ASCII escapes use Kre{\u i}n instead of Kre{\u \i}n. That said, if you are OK with using Unicode, use Kreĭn (as suggested by David). – moewe Nov 28 '21 at 10:24
  • @moewe although (as has been discussed before) \u i and \u\i not being treated the same way is definitely a biblatex and/or biber bug. – David Carlisle Nov 28 '21 at 10:26
  • Accents on the i are a bit tricky in biblatex. See https://tex.stackexchange.com/q/251261/35864, https://tex.stackexchange.com/q/469555/35864 – moewe Nov 28 '21 at 10:26

1 Answers1

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U+0306 is the combining breve accent not ĭ which is U+012D, it is not really possible to support combining characters with pdftex as they follow the base.

Make sure your input has the single character ĭ (U+012D) not the pair ı (U+0131) ̆ (U+0306)

The output you describe is consistent with the input U+0131 producing \i followed by U+0306 producing \u\i following your redefinition of the combining accent.

In the original bib file source you can use ĭ or {\u i} either of which which will generate the correct output.

David Carlisle
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