Btukfyl

I expercience problems with textsuperscript and the package newtxtext. When I use textsuperscript it is not "turned off" afterwards: MWE

documentclass[a4paper,12pt]{scrbook}

usepackage{newtxtext}

begin{document}

21textsuperscript{th} century

end{document}

yields

21textsuperscript{th} textnormal{century}

yields

It should not be necessary to "turn off" textsuperscript. Correct? Any ideas?

Edit: I am using shareLatex with pdfLatex. Output of File List:

 scrbook.cls    2017/04/13 v3.23 KOMA-Script document class (book)

scrkbase.sty    2017/04/13 v3.23 KOMA-Script package (KOMA-Script-dependent bas

ics and keyval usage)

 scrbase.sty    2017/04/13 v3.23 KOMA-Script package (KOMA-Script-independent b

asics and keyval usage)

  keyval.sty    2014/10/28 v1.15 key=value parser (DPC)

scrlfile.sty    2017/04/13 v3.23 KOMA-Script package (loading files)

tocbasic.sty    2017/04/13 v3.23 KOMA-Script package (handling toc-files)

scrsize12pt.clo    2017/04/13 v3.23 KOMA-Script font size class option (12pt)

typearea.sty    2017/04/13 v3.23 KOMA-Script package (type area)

newtxtext.sty    2017/05/28 v1.523

fontaxes.sty    2014/03/23 v1.0d Font selection axes

 xkeyval.sty    2014/12/03 v2.7a package option processing (HA)

 xkeyval.tex    2014/12/03 v2.7a key=value parser (HA)

etoolbox.sty    2017/01/02 v2.4 e-TeX tools for LaTeX (JAW)

 fontenc.sty

   t1enc.def    2017/04/05 v2.0i Standard LaTeX file

textcomp.sty    2017/04/05 v2.0i Standard LaTeX package

  ts1enc.def    2001/06/05 v3.0e (jk/car/fm) Standard LaTeX file

t1ntxtlf.fd    2015/01/17 v1.0 font definition file for T1/ntx/tlf

  ts1cmr.fd    2014/09/29 v2.5h Standard LaTeX font definitions

t1ntxsups.fd    2015/01/17 v1.0

Many Thanks
Benjamin

I can reproduce the problem with Overleaf. ShareLaTeX and Overleaf are currently using a very old TeX distribution.

It seems to me that textsuperscript in this case doesn't have any argument, it works like bfseries, etc. Therefore, the following code can solve the problem:

documentclass[a4paper,12pt]{scrbook}

usepackage{newtxtext}

begin{document}

21{textsuperscript th} century

end{document}

You can also do something like

documentclass[a4paper,12pt]{scrbook}

usepackage{newtxtext}

makeatletter

let@mycommandtextsuperscript

renewcommandtextsuperscript[1]{{@mycommand #1}}

makeatother

begin{document}

21textsuperscript{th} century

end{document}

Result:

You're using newtxtext version 1.523 that has an error about textsuperscript; you can fix it as follows

documentclass[a4paper,12pt]{scrbook}



% fix the error in version 1.523 of newtxtext

letlatextextsuperscripttextsuperscript

AtBeginDocument{lettextsuperscriptlatextextsuperscript}



usepackage{newtxtext}



begin{document}



21textsuperscript{th} century



end{document}

You can see how the code in newtxtext.sty was actually fixed at http://tug.org/svn/texlive/trunk/Master/texmf-dist/tex/latex/newtx/newtxtext.sty?r1=44458&r2=45074&sortby=date

The package removed the wrong usage of textsu, which is the same I do in the suggested patch.