A Comment on "Computational Complexityof Stochastic Programming Problems"

Although stochastic programming problems were always believed to be computationally chal-lenging, this perception has only recently received a theoretical justification by the seminal workof Dyer and Stougie (Mathematical Programming A, 106(3):423{432, 2006). Amongst others,that paper argues that linear two-stage stochastic programs with fixed recourse are #P-hard evenif the random problem data is governed by independent uniform distributions. We show thatDyer and Stougie's proof is not correct, and we offer a correction which establishes the strongerresult that even the approximate solution of such problems is #P-hard for a sufficiently highaccuracy. We also prove that the approximate solution of linear two-stage stochastic programswith random recourse is strongly #P-hard