1. A : Type
2. B : Type
3. a : EqDecider(A)
4. b : EqDecider(B)
5. sum-deq-aux{\\\\v:l,i:l}(A;B;a;b)  (p,q:A+B. p = q  sumdeq(a;b)(p,q))
  sum-deq(A;B;a;b) ~ sum-deq-aux{\\\\v:l,i:l}(A;B;a;b)

1

sum-deq(A;B;a;b) ~ (ext{sumdeq_DASH_property}{i:l}(A,B,a,b))

1 step

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