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At: length upto 1

d,j,i:. j-i = d ||upto(i;j)|| = d

By:
InductionOnNat
THEN
RecUnfold `upto` 0
THEN
Reduce 0
THEN
SplitOnConclITE
THEN
Reduce 0


Generated subgoal:

11. d:
2. 0 < d
3. j,i:. j-i = d-1 ||upto(i;j)|| = d-1
4. j:
5. i:
6. j-i = d
7. i < j
||upto(i+1;j)||+1 = d
1 step

About:
intnatural_numberaddsubtractequalimpliesall

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