1 |
b: , P:({a..b } Prop). b a  (( i:{a..b }. P(i))  (And i:{a..b }. P(i)))
 | 2 steps |
2 |
2. b: , P:({a..b } Prop). b a  (( i:{a..b }. P(i))  (And i:{a..b }. P(i)))
k: , b: .
b-a = k  ( P:({a..b } Prop). ( i:{a..b }. P(i))  (And i:{a..b }. P(i)))
 | 4 steps |
3 |
2. b: , P:({a..b } Prop). b a  (( i:{a..b }. P(i))  (And i:{a..b }. P(i)))
3. k: , b: .
3. b-a = k  ( P:({a..b } Prop). ( i:{a..b }. P(i))  (And i:{a..b }. P(i)))
b: , P:({a..b } Prop). ( i:{a..b }. P(i))  (And i:{a..b }. P(i))
 | 4 steps |