DISCRETE MATH - Combinatorial Proofs

In this video we discuss how to write a combinatorial proof and learn a cool equality.

[yahirorihuela]

this is amazing. I learned the associative identity in elementary school and always considered it to be useless. A decade later, I see it's potential, thank you johnny's math, very cool.

[jamesbrandes]

Wow! Never knew math could be this interesting!