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Robbert Krebbers authored
Rename `Permutation_nil` and `Permutation_singleton` into `Permutation_nil_r` and `Permutation_singleton_r`. Add lemmas `Permutation_nil_l` and `Permutation_singleton_l`.
Robbert Krebbers authoredRename `Permutation_nil` and `Permutation_singleton` into `Permutation_nil_r` and `Permutation_singleton_r`. Add lemmas `Permutation_nil_l` and `Permutation_singleton_l`.
