init(baseExpression:subscriptExpressions:superscriptExpressions:)
Declaration
init(baseExpression: [AXMathExpression], subscriptExpressions: [AXMathExpression], superscriptExpressions: [AXMathExpression])init(baseExpression: [AXMathExpression], subscriptExpressions: [AXMathExpression], superscriptExpressions: [AXMathExpression])