IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
card pi vs nsub pi2 1. a :
2. 0<a 3. b:((a-1)). (i:(a-1)b(i)) ~ ( i:(a-1). b(i))
4. b : a (i:ab(i)) ~ ( i:a. b(i))
By:
Use:[a:= 0 | b:= a | c:= a-1]
Rewrite by
Thm*a,b:, c:{a...b}, B:({a..b}Type).
Thm* (i:{a..b}B(i)) ~ ((i:{a..c}B(i))(i:{c..b}B(i)))