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Add proofs of functor-laws on delta
author Yasutaka Higa <e115763@ie.u-ryukyu.ac.jp>
date Fri, 13 Feb 2015 17:13:23 +0900
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delta-preserve-id :  {l : Level} {A : Set l} {n : Nat} -> 
    (d : Delta A (S n)) -> (delta-fmap id) d ≡ id d
delta-preserve-id (mono x)    = refl
delta-preserve-id (delta x d) = cong (delta x) (delta-preserve-id d)