UK TeX FAQ -- question label secindent

### Indent after section headings

LaTeX implements a style that doesn’t indent the first paragraph after a section heading. There are coherent reasons for this, but not everyone likes it. The indentfirst package suppresses the mechanism, so that the first paragraph is indented.

`indentfirst.sty`
  Distributed as part of macros/latex/required/tools (or browse the directory); catalogue entry

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