What is the number of idempotent functions ?

# Month: March 2017

# [Some punny title about determinants and fixed points]

Prove the following identity

the sum running through and the matrix being of size .

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Month: March 2017

# It’s counting time

# [Some punny title about determinants and fixed points]

What is the number of idempotent functions ?

Prove the following identity

the sum running through and the matrix being of size .