
 
  T:Type, R:(T
T:Type, R:(T
 Prop). (
Prop). ( f:(
f:( n
n
 T). Bij(
T). Bij( n; T; f))  &  (
n; T; f))  &  ( t:T. Dec(R(t)))
t:T. Dec(R(t))) 
 Dec(
 Dec( t:T. R(t))
t:T. R(t))| 1 |    T:Type, R:(T   Prop). (  f:(  0   T). Bij(  0; T; f))  &  (  t:T. Dec(R(t)))   Dec(  t:T. R(t)) | 
| 2 | 1. n:  2. 0 < n 3.  T:Type, R:(T   Prop). (  f:(  (n-1)   T). Bij(  (n-1); T; f))  &  (  t:T. Dec(R(t)))   Dec(  t:T. R(t))    T:Type, R:(T   Prop). (  f:(  n   T). Bij(  n; T; f))  &  (  t:T. Dec(R(t)))   Dec(  t:T. R(t)) | 
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