%0 Journal Article %T Cosmic complementarity: combining CMB and supernova observations %A Max Tegmark %A Daniel J. Eisenstein %A Wayne Hu %J Physics %D 1998 %I arXiv %X We compute the accuracy with which Omega and Lambda can be measured by combining future SN Ia and CMB experiments, deriving a handy expression for the SN Ia Fisher information matrix. The two data sets are found to be highly complementary: a joint analysis reduces the error bars by more than an order of magnitude compared to a separate analysis of either data set. %U http://arxiv.org/abs/astro-ph/9804168v2