(14steps) PrintForm Definitions Lemmas int 2 Sections StandardLIB Doc

At: decidable ex int seg 1 1 1

1. i:
2. j:
3. F: {i..j}Prop
4. k:{i..j}. Dec(F(k))
5. ij

n:{...j}. in Dec(k:{n..j}. F(k))

By:
BackThru Thm* i:, E:({...i}Prop). E(i) (k:{...i-1}. E(k+1) E(k)) (k:{...i}. E(k))
THEN
RepD


Generated subgoals:

16. ij
Dec(k:{j..j}. F(k))
26. n: {...j-1}
7. in+1 Dec(k:{(n+1)..j}. F(k))
8. in
Dec(k:{n..j}. F(k))


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intfunctionpropimpliesallexists

(14steps) PrintForm Definitions Lemmas int 2 Sections StandardLIB Doc