Rui Duarte, António Guedes de Oliveira
Published 2013-07-25Version 1
We explain how the identity $$\sum_{i+j=n}\binom{2i}{i}\binom{2j}{j}\;=\;\displaystyle4^n$$ is an easy consequence of the inclusion-exclusion principle.
Analysis of the parallel peeling algorithm: a short proof
A short proof that NMF is NP-hard
A short proof of a lower bound for Turán numbers
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