> And crazy umlaut looking things in coöperate. If I recall correctly, I've seen Knuth use the diaeresis [1] in The TeXbook as well. [1] https://en.wikipedia.

> And crazy umlaut looking things in coöperate. If I recall correctly, I've seen Knuth use the diaeresis [1] in The TeXbook as well. [1] https://en.wikipedia.org/wiki/Diaeresis_(diacritic) https://en.wikipedia.org/wiki/Diaeresis_(diacritic)