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Originally Posted by Mr. Teacher
Dearest Pookie
If it takes four men with buckets three hours to fill two baths with water, how long will it it take six men with watering cans to cross the English Channel in a rubber dinghy?
Fond regards,
Your maths teacher
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This formula expresses the fact that differentiation and integration are inverse operations of each other. Therefore, if d=dinghy, then it is easy to see that for finite sets d (dinghy) equals the cardinality of the power set equals f (watering can) equals x (channel).
So if this calculation is applied, then d/dx, together with that long line with the bends at either end and an x and a supporting it, added to the f (watering can) (s) (s) d (dinghy) s (s) = f (watering can) (x) (channel).