I think I used the third one (the harmonic one) before this ;)
1. Edge of Tomorrow
4. Identity Thief
5. Source Code
7. The Gray
8. ?Step Up?
9. 21 and Over
10. Need for Speed (very clever, the absolute sign!)
I don't know any of these movies except Gravity ._.
Most of them are pretty new
The Seven Steps, I think (http://www.imdb.com/title/tt2036464/)
Haven't heard of 21 and over but I know there is a movie called Grown Ups (with a sequel).
8 could also be The Seventh Floor (it is the floor function).
Why is 6 limitless? We don't know if the limit exists for that function.
@mfb Limit + less (than)
3 could also be "Infinity" (http://www.imdb.com/title/tt0217571/) as the sum approaches infinity.
8 could be "The Staircase" (http://www.imdb.com/title/tt0152588/) as it is the staircase function.
4 = The Matrix
I can't figure out the "negative standard gravity" one?