Merge pull request #1740 from herbelin/master+qualifying-idtoiso · HoTT/Coq-HoTT@c89dc10

adj is declared opaque (Qed) but this is not fully respected inside

esp1_beta_pglue is declared opaque (Qed) but this is not fully

esp2_beta_pglue is declared opaque (Qed) but this is not fully

natpaths_symm is declared opaque (Qed) but this is not fully

f_preserves_0 is declared opaque (Qed) but this is not fully

f_preserves_1 is declared opaque (Qed) but this is not fully

f_S is declared opaque (Qed) but this is not fully respected inside

f_preserves_plus is declared opaque (Qed) but this is not fully

f_preserves_mult is declared opaque (Qed) but this is not fully

succunary is declared opaque (Qed) but this is not fully respected

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