False. Math phd would probably write O(log n) based on either multiplying [[1,0], [1,1]] matrix or compute it directly for smaller numbers and return the rounde

False. Math phd would probably write O(log n) based on either multiplying [[1,0], [1,1]] matrix or compute it directly for smaller numbers and return the rounded power of golden ratio for higher numbers. Notice that for big enough numbers psi becomes insignificant enough, so that we can only use phi.