The second of this man's namesake functions is sometimes approximated as x 
The second of this man's namesake functions is sometimes approximated as x minus the log of two pi. That the remainder when dividing prime numbers by 4 is more likely to be 3 than 1 is called this man's "bias". His namesake distance operation is sometimes called the chessboard distance, and his two namesake polynomial sequences, symbolized T sub n and U sub n, have recursive definitions, as they are solutions to his namesake differential equation. He names a relation which was actually formulated by Bienaym?and states that no more than one over k squared of the total values are more than k standard deviations away from the mean of any probability distribution. For 10 points, name this Russian mathematician best known for that namesake inequality.
The second of this man's namesake functions is sometimes approximated as x minus the log of two pi.
Pafnuty Chebyshev