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Название: Principles of combinatorics, Volume 72
Автор: Berge C.
Most mathematicians of this day, confronted with an argument requiring combinatorial thinking, react with one of two stock phrases: (a) “This is a purely combinatorial argument,” (b) “This is a difficult combinatorial argument.” Hypnotic repetition of either of these slogans is likely to have the same balming effect on the speaker: freed from all scruples, he will pass the buck and unload the work onto someone else’s shoulders.