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At: decidable ex int seg 1 1

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

Dec(k:{i..j}. F(k))

By:
Assert (n:{...j}. in Dec(k:{n..j}. F(k)))
THEN
IfLabL [`main`,(InstHyp [i] -1)]


Generated subgoal:

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


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intfunctionpropimpliesallexists

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