---
title: "init(baseExpression:prescriptExpressions:postscriptExpressions:)"
framework: Accessibility
role: symbol
role_heading: Initializer
platforms: [iOS 18.2+, iPadOS 18.2+, Mac Catalyst 18.2+, macOS 15.2+, tvOS 18.2+, visionOS 2.2+, watchOS 11.2+]
path: "accessibility/axmathexpressionmultiscript/init(baseexpression:prescriptexpressions:postscriptexpressions:)"
---

# init(baseExpression:prescriptExpressions:postscriptExpressions:)

## Declaration

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