Episode Titles: Derivation
You are viewing a list of 2 The Big Bang Theory episodes featuring "Derivation" in their title.
Season 4, Episode 17 - The Toast Derivation
Aired February 24, 2011
With Leonard and Priya now dating, the gang are spending more time at Priya's apartment. Sheldon is uncomfortable with this change but is powerless to stop it. After realizing Leonard is the center of their social group, not him, Sheldon sets out to find a new group of friends who will have fun his way. Meanwhile, Penny tries to move on after seeing Leonard in his new relationship.
Season 12, Episode 7 - The Grant Allocation Derivation
Aired November 1, 2018
Leonard is caught between a rock and a hard place when he's responsible for distributing extra grant money. Also, Bernadette turns the backyard playhouse into a hideaway from her husband and kids.