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New posts in Combinatorial Proofs
finite sum with combinatorics
May 07, 2021
Algebraic proof of a combinatoric question (Combinatoric proof is given)
May 07, 2021
proving the identity $b^3 = 6\binom{b}{3} + 6\binom{b}{2} + b$ for $b \in \mathbb{N}$, $b > 2$, by counting a set in different ways
May 07, 2021
Bijection between Dyck paths with $k$ peaks and $n+1-k$ peaks
May 07, 2021
Combinatorial Proof of $3^n - 2^n = \sum_{i=0}^{n-1}2^i3^{n-1-i}$
May 06, 2021
How do I prove this combinatorial identity
May 06, 2021
Combinatorial argument for solution of recursion behaving similarly as Pascals triangle?
May 06, 2021
Is it valid to define $\binom{n}{n+k} = 0$
May 05, 2021
How to show $n=1+\sum_{k=1}^{n}\left\lfloor{\log_2\frac{2n-1}{2k-1}}\right\rfloor$ for every natural number $n$.
May 05, 2021
Is there a combinatorial proof that $e$ is finite?
May 05, 2021
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