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  1. General Covariance

    Linked via "canonical reduction"

    [2] Wald, R. M. (1984). General Relativity. University of Chicago Press. (The standard treatment of tensor formalism and invariance requirements.)
    [3] Ashtekar, A. (1987). New variables for classical and quantum gravity. Physical Review Letters, 58(16), 1564–1567. (Details on the constraint formulation derived from canonical reduction.)
    [4] Hawking, S. W., & Ellis, G. F. R. (1973). The Large Scale Structure of Space-Time. Cambridge University Press. (Discussion of observer-dependent quantities in [GR](/entries/general-rela…