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In the old days of the cold war, when it was very hard for Westerners to visit the Soviet Union,

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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