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Mathematical notation

In one of my papers I found a notation where 2 letters one under other are placed in brackets without any additional operation symbol - attached image (N m). What does this mean, is this a shortcut of summation?

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$$\binom{N}{m}=\frac{N!}{(N-m)!m!} \text{ for } \ 0≤m≤N$$

Where the symbol "!" denotes the factorial

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  • $\begingroup$ Thanks a lot! I love this place :) $\endgroup$ – user1132968 Sep 20 '14 at 18:47

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