== if x=0
1 else x
(x-2)! fi (recursive)
x:{x:
| (x rem 2) = 0 }. x! 
j == if i=j true ; false fii,j:
. (i=j) 
== {i:| 0
i } Type
b T == 
a = b TA:Type, x,y:A. (x y) Prop| Some definitions of interest. | |
| sfa_doc_factorial2 | == if x=0 1 else x(x-2)! fi (recursive) |
| x:{x:| (x rem 2) = 0 }. x! | |
| eq_int | j == if i=j true ; false fi |
| i,j:. (i=j) | |
| nat | == {i:| 0i } |
| Type | |
| nequal | b T == a = b T |
| A:Type, x,y:A. (x y) Prop |
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