Implementation of Church numerals, of 
calculus and the addition procedure.
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| (define | |
| zero | |
| (lambda (f) | |
| (lambda (x) | |
| x))) | |
| (define | |
| one | |
| (lambda (f) | |
| (lambda (x) | |
| (f x)))) | |
| (define | |
| two | |
| (lambda (f) | |
| (lambda (x) | |
| (f (f x))))) | |
| (define (add-1 n) | |
| (lambda (f) | |
| (lambda (x) | |
| (f | |
| ((n f) | |
| x))))) | |
| (define (add a b) | |
| (lambda (f) | |
| (lambda (x) | |
| ((a f) | |
| ((b f) | |
| x))))) | |