Thanks for stopping by to help with my question. I'm trying to mimic what my professor did in our notes, putting a box around a specific portion of a continued fraction, shown below:

Continued fraction box

Here's the LaTex code I was trying to use for the continued fraction itself (sorry, I don't know how to format it so it looks nice like other questions I've seen on here):


Any help you might be able to provide would be much appreciated!

1 Answer 1


Simply use \boxedn and don't use $$ … $$, which is plain TeX code and produces bad spacing. Use [ … \] instead for unnumbered display formulae. Also with :=, the colon is not centred on the maths axis. Prefer \coloneqq instead, which is defined in mathtools, an extension of amsmath:



\[ X\coloneqq\cfrac{1}{a+\boxed{\cfrac{1}{a+\cfrac{1}{a+\cfrac{1}{a+\cfrac{1}{a+ ⋯ }}}}}} \]


enter image description here

  • Thanks, @Bernard! I appreciate your help and assistance in formatting my question.
    – jbrow35
    Commented Oct 20, 2016 at 0:48
  • You're welcome. Always glad to help!
    – Bernard
    Commented Oct 20, 2016 at 0:53

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