TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I would like to write a power on top of a power as in this sample equation:enter image description here

I can write e^-{(lambda \, t)} for the first power and then how to add the alpha exponent? LaTeX does not allow another ^.

share|improve this question
It does, but you must contain it within the first power: e^{-(\lambda \, t)^{\alpha}}. After all, it is -(\lambda \, t) that you are raising to the power of \alpha (and, of course, e is being raised to the power of all of that) – Au101 Feb 25 at 6:55
You have to use braces: e^{\lambda t^\alpha}, since ^ only raises the next token with respect to the current "baseline" – manthano Feb 25 at 6:57
up vote 9 down vote accepted

Successive superscripts need to be placed inside a braced group:

enter image description here




  F(t) = \Pr(T \leq t) = \begin{cases}
    1 - e^{-(\lambda t)^\alpha} & \text{for $t > 0$} \\
    0                           & \text{otherwise}

share|improve this answer
I'd recommend using the cases* environment from the mathtools package instead, as that typesets the second column in text mode. – hooy Feb 25 at 6:59

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.