The Pages Equation editor is a LaTeX/MathML translator that does not directly support your sought integral, and cannot load the AMSmath and other packages that have a convenience operator allowing this character entry.
You need to do the following:
- Open the Equation Editor, and enter \text{}, then position your cursor inside the brackets.
- Enter ctrl+cmd+spacebar to launch the character viewer. Enter the word integral in its search window.
- Locate the finite part (⨍) integral; the integral average with slash (⨏), or even the Integral with double stroke (⨎) character that you need and double-click it to insert it within the curly braces.
When you have done the above, the Equation editor will display the correct integral symbol.
