({{, (RefLink[AllowScriptLevelChange, paclet:ref/AllowScriptLevelChange]) 
is an option for fractions and grids that controls whether certain operators, such as ∑, ∏, and ∫, always appear smaller than normal size.}})

OpenersNotesSection(Spacer1)Details

A fraction can be created using (Key1[ctrl, /]) or (MenuGrayLink[Insert, paclet:guide/InsertMenu]) ▶ (MenuGrayLink[Typesetting, paclet:ref/menuitem/Typesetting]) ▶ Fraction.

Certain formatting constructs change the level, or (RefLink[ScriptLevel, paclet:ref/ScriptLevel]), at which a selection is displayed. For example, b occurs at the second level of (a^b) and has (RefLink[ScriptLevel, paclet:ref/ScriptLevel])->2. By default, fractions also increment the (RefLink[ScriptLevel, paclet:ref/ScriptLevel]) of the numerator and denominator; for example, each character in (a/b) has (RefLink[ScriptLevel, paclet:ref/ScriptLevel])->2. By default, grids also increment the (RefLink[ScriptLevel, paclet:ref/ScriptLevel]) of their elements; for example, each character in ({{a, b}, {c, d}}) has (RefLink[ScriptLevel, paclet:ref/ScriptLevel])->2.

With the default setting (RefLink[AllowScriptLevelChange, paclet:ref/AllowScriptLevelChange])->(RefLink[True, paclet:ref/True]), (RefLink[ScriptLevel, paclet:ref/ScriptLevel]) is incremented by 1 for the numerator and denominator for each entry in a grid. This means that operators affected by (RefLink[LimitsPositioning, paclet:ref/LimitsPositioning]) appear smaller than normal size, as shown here.

((∫f)/1) ∫f

({{(∑_(j=1)^100), (∏_(i=1)^n)}, {(∫_a^b), (Underscript[\[Limit], n->∞])}})  (∑_(j=1)^100)

With the setting (RefLink[AllowScriptLevelChange, paclet:ref/AllowScriptLevelChange])->(RefLink[False, paclet:ref/False]), (RefLink[ScriptLevel, paclet:ref/ScriptLevel]) is not incremented for the numerator and denominator and grid entries; in other words, (RefLink[ScriptLevel, paclet:ref/ScriptLevel]) for a selected part has the same value as it would outside the fraction or grid. With this setting, subexpressions within a fraction or grid can have a (RefLink[ScriptLevel, paclet:ref/ScriptLevel]) of 0, which allows operators such as ∑, ∏, and ∫ to appear at their normal size and formatting, as shown here.

((∫f)/1) ∫f

({{(∑_(j=1)^100), (∏_(i=1)^n)}, {(∫_a^b), (Underscript[\[Limit], n->∞])}}) (∑_(j=1)^100)

For a selected fraction or grid, (RefLink[AllowScriptLevelChange, paclet:ref/AllowScriptLevelChange]) is set as an option for (RefLink[FractionBox, paclet:ref/FractionBox]) or (RefLink[GridBox, paclet:ref/GridBox]) and applies only to the selection.

At the cell level, (RefLink[AllowScriptLevelChange, paclet:ref/AllowScriptLevelChange]) is set as a suboption of the (RefLink[FractionBoxOptions, paclet:ref/FractionBoxOptions]) or GridBoxOptions option for cells. It specifies the default setting of (RefLink[AllowScriptLevelChange, paclet:ref/AllowScriptLevelChange]) for any fraction or grid in the cell.

({{DocumentationFooterIconsRelatedFunction.png, ({{See Also}, {(RefLink[ScriptLevel, paclet:ref/ScriptLevel])  ▪  (RefLink[LimitsPositioning, paclet:ref/LimitsPositioning])}})}})