Monthly Archives: February 2012


There are two kinds of generalizations. One is cheap and the other is valuable. It is easy to generalize by diluting a little idea with a big terminology. It is much more difficult to prepare a refined and condensed extract … Continue reading

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Another binomial sum

Came across an interesting problem Brent Yorgey from his blog The Math Less Traveled. In this post he tried to explain what is meant by a combinatorial proof to prepare his readers for a proof of this identity [tex] \displaystyle … Continue reading

Posted in Combinatorics | Leave a comment