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 ^.

  • 2
    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 '16 at 6:55
  • 2
    You have to use braces: e^{\lambda t^\alpha}, since ^ only raises the next token with respect to the current "baseline"
    – manthano
    Feb 25 '16 at 6:57

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}

  • 5
    I'd recommend using the cases* environment from the mathtools package instead, as that typesets the second column in text mode.
    – sodd
    Feb 25 '16 at 6:59

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