At: finite decidable subset 1 1 2 1
1. T: Type
2. B: T
Prop
3. n: 
4.
f:(
n
T). Bij(
n; T; f)
5.
t:T. Dec(B(t))
6.
m:
.
m ~ {t:T| B(t) }
n:
, f:(
n
{t:T| B(t) }). Bij(
n; {t:T| B(t) }; f)
By: RWO "bij_iff_1_1_corr < " 6
Generated subgoals:None
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