Go to System Preferences, click the Language & Text icon and then choose the Input Sources tab. Check the "Show Input menu in menu bar" item, and the "Keyboard & Character Viewer" item. Then, from the new item in your menu bar (right side), choose Show Character Viewer. There's a Math category where you should find the symbols you want, and you can insert them from that window.
jayfromnew york wrote:
How do I type mathematical symbols such as Limit, Integral, Square Root, and Summation on the MacBook Pro?
If you are doing a lot of complex math work, you should probably consider an equation editor: