init(baseExpression:prescriptExpressions:postscriptExpressions:)
Declaration
init(baseExpression: AXMathExpression, prescriptExpressions: [AXMathExpressionSubSuperscript], postscriptExpressions: [AXMathExpressionSubSuperscript])init(baseExpression: AXMathExpression, prescriptExpressions: [AXMathExpressionSubSuperscript], postscriptExpressions: [AXMathExpressionSubSuperscript])