Nuprl - Proof: compose iter sum 1 2 1

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At: compose iter sum 1 2 1

1. A : Type
2. x : A
3. f : A

A
4. i :

5.

i1:

. i1<i

(

j,k:

. k = i1+j

f{

i1}(f{

j}(x)) = f{

k}(x))
6. j :

7. k :

8. k = i+j
9.

i = 0

f(f{

i-1}(f{

j}(x))) = f(f{

k-1}(x))

By:

Analyze

Generated subgoal:

1 f{i-1}(f{j}(x)) = f{k-1}(x)
1 step

About:

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(6steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc