r*f
发帖数: 731 | 1 An astronomer, a physicist and a mathematician (it is said) were
holidaying in Scotland. Glancing from a train window, they
observed a black sheep in the middle of a field.
"How interesting," observed the astronomer, "all scottish sheep
are black!"
To which the physicist responded, "No, no! Some Scottish
sheep are black!"
The mathematician gazed heavenward in supplication, and then
intoned, "In Scotland there exists at least one field, containing at
least one sheep, at least one side of which is |
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