(7steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc
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At: exteq sum family singleton vs intseg 1

1. a : 
2. a' : 
3. a'-a = 1
4. B : {a..a'}Type
  (i:{a..a'}B(i)) =ext ({a:}B(a))


By: Analyze THEN Analyze
THEN
New:[i | b] Analyze-1 THEN Analyze
THEN
Try BackThru: Thm*  a,a':a'-a = 1  ({a..a'} =ext {a:})


Generated subgoals:

1 5. i : {a..a'}
6. b : B(i)
  b  B(a)

2 steps
2 5. i : {a:}
6. b : B(a)
  b  B(i)

3 steps

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(7steps total) PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc