Proving the Hockey Stick Identity with the Summation Identity
8476
Proof of the Hockey-Stick Identity: $\sum\limits_{t=0}^n \binom tk = \binom{n+1}{k+1}$
23071
Showing that $f_0 (x_1, \ldots, x_m) \mathrm tr A =\displaystyle{ \sum_{i=1}^n} f_0(x_1, \ldots, Ax_i,\ldots, x_m)$
18158
Inductive Proof for Vandermonde's Identity?
27629
How to prove that $S^{2n+1}/S^1$ is homeomorphic to $\mathbb CP^n$ under a given identification
51465
New, elegant proofs for $\varphi(p^{k})=p^{k}-p^{k-1}$
100788
Proving Newton's identities
158508
Combinatorial Proof for Binomial Identity: $\sum_{k = 0}^n \binom{k}{p} = \binom{n+1}{p+1}$
50266
In the following figure prove that: $AK||BC$
35525
Methods to compute $\sum_{k=1}^nk^p$ without Faulhaber's formula
4610
Proving an identity with a combinatorial proof: $\binom{n}{k}\binom{k}{r}=\binom{n}{r}\binom{n-r}{k-r}$
147886
Proof of the angle sum identity for $\sin$
114524
Proof Verification: the orthogonal complement of the column space is the left nullspace
90904
Combinatorial proof of an identity with squared binomial coefficients
54737
Proof that $V = \sum_k U_k$ and $\dim V=\sum_k \dim U_k$ implies $V=\oplus_k U_k$
61483
Prove the following identity combinatorially
89552
proving combinatorics identity - $\sum_{k=0}^m{n-k \choose m-k}={n+1 \choose m}$
122481
proof of an identity for exponential function