In The Old Days Of The Cold War, When It Was Very Hard For Westerners To Visit The Soviet Union, A British Mathematician Travels To Moscow To Speak In The Seminar Of A Famous Russian Professor.

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In the old days of the cold war, when it was very hard for Westerners to visit the Soviet Union, a British mathematician
travels to Moscow to speak in the seminar of a famous Russian professor.

He starts his talk writing a theorem on the board. When he wants to prove it, the professor interrupts him:
"This theorem is clear!"

The speaker is, of course, annoyed, but manages to conceal it. He continues his talk with a second theorem,
but, again, when he wants to start with the proof, he is interrupted by his host: "This theorem is also clear!"

With a stern face, he writes a third theorem on the board and asks: "Is this theorem clear, too?!"

His host nods.

The visitor grins and says: "This theorem - is false..."

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