The easiest way to get from the airport to USC is by taxi or some ride-sharing company (say Uber or Lyft). Taxi fares are about $50, but Uber and Lyft may be cheaper.
It is cheaper to take a ride-sharing service; two options are SuperShuttle and PrimeTime.
While it is, in principle, possible to get from Los Angeles airport to the USC Campus by public transportation, it is logistically complicated.
* It is a short walk from the housing complex to the math department.
* Breakfast will be served in the common room at the mathematics department beginning at 9am each morning of the summer school.
Lunch and Dinner: There are a number of on-campus dining options. There are also some restaurants located on Figuroa Avenue, just East of campus; these are probably the most convenient option for lunch. For dinner, you may take the Dash bus or the Exposition line train downtown.