t else f fi == InjCase(b ; t; f)
b:
, A:Type, p,q:A. if b p else q fi 
A| Who Cites ifthenelse? | |
| ifthenelse | Def if b t else f fi == InjCase(b ; t; f) |
| Thm* b:, A:Type, p,q:A. if b p else q fi A |
| Syntax: | if b t else f fi | has structure: | ifthenelse(b; t; f) |
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