Trying to use notation of the form (a, b)\underset{{+}}{\bumpeq}(c, d), I find the combined symbol \underset{{+}}{\bumpeq} too much spread vertically for my purposes:

$(a, b)\underset{{+}}{\bumpeq}(c, d)$

How can the vertical spacing in \underset and \overset be controlled?

  • Could you please post a complete compilable code?
    – Bernard
    Oct 10, 2021 at 12:55

1 Answer 1


You can use a low level alignment tool.


      $\m@th#1\bumpeq$\cr % top


(a, b)\bumpeqplus(c, d)_{x\bumpeqplus y}


Change 2mu after experimenting some values (always in mu units).

enter image description here

In case you need also other symbols instead of + you can define other commands, for instance


and nothing else is required.

  • Hi, visually I think in subscript mode the size of the symbol created looks too big to me.
    – Sebastiano
    Oct 10, 2021 at 21:48
  • 1
    @Sebastiano The proportions seem the same. I don't really like the symbol, to be honest.
    – egreg
    Oct 10, 2021 at 21:57
  • ahahaahh..also for me...But does this symbol is used? :-( Never I have seen this notation. It reminds me of the rank of second officer when I was in the Italian Navy.
    – Sebastiano
    Oct 10, 2021 at 21:59

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