Align numerator of fraction to the center

Question

Following LaTeX displays the numerator to the left. Question: How can we align the numerator (just like the denominator is) to the center:
frac{pi^2}{6}

Display of the above LaTeX:

I tried this suggestion from @DavidCarlisle for another scenario - and it (as asked by the OP there) displays the denominator to the left that makes both numerator and denominator look aligned to the left. But, in my case, I would like the numerator to be aligned to the center (with the denominator).
frac{pi^2}{6hfill}

Display of the above LaTeX:

Desired output:

Werner · Accepted Answer

Here are some options:

documentclass{article}

begin{document}

[
  frac{pi^2}{6} quad % Default
  frac{hphantom{^2}pi^2}{6} quad % Symmetric exponent around pi
  frac{!hphantom{^2}pi^2!}{6} % Reduced horizontal width of numerator
]

end{document}

Don Hosek · Answer

To get a zero-width ², you'll want to define
newcommandzwe[1]{rlap{${}^{#1}$}}

[
  frac{pizwe{2}}{6}
]

although this will have the superscript extending beyond the fraction bar. An alternative definition for zwe would be to take both the base and exponent as arguments and use an hphantom on the left to balance the superscript on the right:
newcommandzwe[2]{hphantom{{}^{#2}}#1^{#2}}

[
  frac{zwe{pi}{2}}{6}
]

wipet · Answer

Use ! at the end of the numerator. Sometimes we need to correct the math spacing to get visually better results. For example:
{pi^2! over 6}, quad Gamma!_2.

Align numerator of fraction to the center

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