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• #### Numb3rs: Random matrices

In Episode 207, "Convergence," an old college rival comes to CalSci (Marshall Penfield, played by Colin Hanks,) to present new research on a gap he has found in Charlie's proof. Although Charlie does find a way to resolve the error term, it isn't clear to many people watching still what type of math Charlie really does do! What he studies falls into the area of probability and statistics involving what are called "random matrices." While the first activity has no prerequisites, the latter activities all assume some basic knowledge of linear algebra, matrices, and determinants.

• #### Numb3rs: Blackjack and Game Theory

Charlie explains the rules of Blackjack and how players are able to count cards.

• #### Numb3rs: The Art of Reckoning

In this clip, the main mathematical concepts derive from a field called game theory. The goal of game theory is to take some social situation with some notion of winning and come up with a formal, mathematical way of discussing it.

• #### Numb3rs: Decision Theory

Charlie explains how he narrows down a suspect pool using reverse decision theory. He compares decision theory to a hunter. You can use decision theory to see what animal a hunter is most likely to kill. You can also use the reverse and look at a kill and determine which hunter was most likely to have hunted that animal.

• #### The Big Bang Theory: The Wedding Gift Wormhole

Sheldon and Amy go to the coffee shop where they first met to find a clue about the gift that Leonard and Penny left them. They rationalize their findings even though their rationalizations seem like a huge, unrealistic stretch