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Today:
The Department of Mathematics will hold a Major/Minors Lunch from 11:30am-1:30pm on Friday, November 30. All mathematics majors and minors are welcome (or even those thinking about it). This is a great opportunity to get together with other students and faculty on a very informal basis, and learn more about what math can do for you, and you for math.
Proof: using the definition of the inverse, and the chain rule.