An engineer is working at his desk in his office, as his cigarette falls off the desk into the wastebasket, causing the papers within to burst into flames.
He immediately deduces the most logical place of the fire extinguisher, grabs it, puts out the flames, and goes back to work.
A physicist is working at his desk, as the same thing happens to him.
He looks at the fire, remembers that fire = fuel + oxygen + heat, decides to block the oxygen supply, looks around, spots the fire extinguisher, grabs it, puts out the flames and goes back to work.
A mathematician is working at his desk as the same thing happens to him.
He looks at the fire, remembers the fire extinguisher in the hallway, concludes that a solution exists, and goes back to work.
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