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  • FractionBox[ x , y ] represents in input and output.
  • Inside \( ... \) FractionBox[ x , y ] can be input as x \/ y.
  • In a notebook a FractionBox can be created using /. moves out of the fraction.
  • In StandardForm and InputForm, FractionBox[ x , y ] is interpreted on input as x / y.
  • The axis of FractionBox[ x , y ] is taken to go through the fraction line. The baseline lies below the axis by the distance between the axis and the bottom of characters such as ( in the current font.
  • The width of the fraction line can be given in x-heights as the setting for the SpanLineThickness option in StyleBox.
  • If FractionBox[ x , y ] does not fit on a single line, it is output as x / y.
  • In StandardForm, explicit FractionBox objects are output literally. You can use DisplayForm to see the display form of such objects.
  • See the Mathematica book: Section 2.8.10.
  • See also: OverscriptBox, GridBox.