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* From: Jens Axel Søgaard <jensaxel@xxxxxxxxxxxx> | The specifications of mu and nu are: (mu <expr> ...) => (lambda (f) (f <expr> ...)) (nu <expr> ... <exprn>) => (lambda (f) (apply f <expr> ... <exprn>)) The <exprn> should be a list. | These are indeed useful operations. So useful that we already have | a srfi for them, namely srfi-26. | (cut <> <expr> ...) => (lambda (f) (f <expr> ...)) | (cut apply <> <expr> ... <exprn>) => (lambda (f) (apply <expr> ... <exprn>)) It matters little whether we use (lambda (f) (f 1 2 3)) or (cut <> 1 2 3) or (mu 1 2 3) or any other its equivalent. The point is we know they can be used in this way. -- Nothing is complete unless you put it in final shape.