I am using the amsfont package where I can use mathbb to format for instance the symbol for real numbers as follows


I want however to include exponents, though my approach so far looks quite terrible:


How can this be resolved? Thanks

  • 1
    Why is this result terrible? What is it that you would want?
    – gebruiker
    Commented Apr 1, 2018 at 13:02
  • 6
    It should be \mathbb{R}^{n\times 1}
    – egreg
    Commented Apr 1, 2018 at 13:04
  • 2
    @egreg or \mathbb{R}^{n} ? Commented Apr 1, 2018 at 13:40
  • 3
    @DavidCarlisle That's a notation sometimes used for denoting the n-row, 1-column matrices.
    – egreg
    Commented Apr 1, 2018 at 13:41
  • @egreg yes I guessed that's what it meant (although not a notation I'm familiar with:-) Commented Apr 1, 2018 at 13:42

1 Answer 1


I guess you want to use \times instead of x (which is always wrong for denoting any kind of multiplication):

\usepackage{amssymb} % or just amsfonts


Wrong notation: $\mathbb{R}^{nx1}$

Right notation: $\mathbb{R}^{n\times 1}$


enter image description here


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