Superscript
MathNaryOperator.Superscript property
指定一个上标参数，例如在积分的情况下设置上限
public IMathElement Superscript { get; }
示例
示例：
[C#]
IMathNaryOperator naryOperator = new MathematicalText("x").Nary(MathNaryOperatorTypes.Summation, "x=1", "100");
IMathElement superscriptArg = naryOperator.Superscript;
