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Iteration over a null sequence is the identity element.

At: iter via intseg null

  A:Type, f:(AAA), u:A, a,b:, e:({a..b}A).
  ba  (Iter(f;u) i:{a..b}. e(i)) = u
By: Auto

Generated subgoal:

1 1. A : Type
2. f : AAA
3. u : A
4. a : 
5. b : 
6. e : {a..b}A
7. ba
  (Iter(f;u) i:{a..b}. e(i)) = u
1 step

About:
intfunctionuniverseequalimpliesall
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html

(2steps total) PrintForm Definitions IteratedBinops Sections DiscrMathExt Search Doc