Concrete math Two-key to generative function Chapter-----Tribute Kunth

Source: Internet
Author: User

About the title made so strange. Because in concrete mathematics. The two chapters are described separately. And the narration is incisively and vividly!

I only ponder a small portion of the generated function (I have enough for the time being.) )

The number of combinations has to be raised before the two-item coefficients are raised. Used in high school is the symbol C to express. But in concrete mathematics. This symbol is expanded. Even if there are negative cases (there is no longer a specific meaning of the number of combinations of objects that are removed from some objects, do you want to take something out of the negative number of things?)

Use

(N,k) on behalf of C (K,n)

Concrete math Two-key to generative function Chapter-----Tribute Kunth

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