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+;;;;;;; problem 3.13
+
+(define ((henon-map alpha) x y return failure)
+ (if (or (> x 1) (< x -1) (> y 1) (< y -1))
+ failure)
+ (return (- (* x (cos alpha))
+ (* (- y (square x)) (sin alpha)))
+ (+ (* x (sin alpha))
+ (* (- y (square x)) (cos alpha)))))
+
+(define window (frame -1. 1. -1. 1.))
+
+(explore-map window (henon-map 1.21) 2000)
+
+