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Built-in Mathematica Symbol

FractionBox

FractionBox[x, y]
is a low-level formatting construct that represents

in notebook expressions.

In a notebook a FractionBox can be created using Ctrl+/. Ctrl+Space 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.

In StandardForm, explicit FractionBox objects are output literally. You can use DisplayForm to see the display form of such objects.

Display a typeset fraction:

Display a fraction with typeset structures in the numerator and denominator:

Display a typeset fraction:

Out[1]//DisplayForm=

Display a fraction with typeset structures in the numerator and denominator:

Out[1]//DisplayForm=