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| #lang racket | |
| (define (ε i j k) | |
| (* (- i j) (- j k) (- k i) 1/2)) | |
| (define (cross-product v w) | |
| (define ref vector-ref) | |
| (for/vector ([i 3]) | |
| (for*/sum ([j 3] [k 3]) | |
| (* (ε i j k) (ref v j) (ref w k))))) |
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