FractionBox
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 , 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.
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 on the web:Section 2.8.10.
See also: OverscriptBox, GridBox.
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