how to write limit formulas with TexMacs

Salvatore Valentino <[email protected]>
Newsgroups gmane.editors.texmacs.user
Message-ID <CADaif13KCEkujQ_1iE6sQzUUttDBG+V0tuna+BivsPZOwCRtOg@mail.gmail.com> 
Hello, there! I've troubles on how to write limit formulas with TexMacs ,
particularly how can I put te x with arrow and vale placed under the word
"Iim " as usually . Thank you .
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