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based on an earlier version of the Wolfram Language.
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Underoverscript

Underoverscript[x, y, z]
is an object that formats as .
  • In a notebook an underoverscript can be created by using Ctrl++ to move to the underscript, then Ctrl+% to move to the overscript. Ctrl+Space moves out of the underscript or overscript position.
  • Input of the form in a notebook is interpreted as Underoverscript[x, y, z].
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