query: Proving that two summations are equivalent: $\sum_{i=1}^n i^3 = (\sum_{i=1}^n i)^2$
positive_passages.docid: 16812
positive_passages.text: Proving $1^3+ 2^3 + \cdots + n^3 = \left(\frac{n(n+1)}{2}\right)^2$ using induction
negative_passages.docid: 38995
negative_passages.text: Induction proof that $\sum_{j=n}^{2n-1} (2j + 1) = 3n^2$ - what happened?
negative_passages.docid: 52113
negative_passages.text: Proof by Induction $\sum_{i=0}^{k-1} 2^i = 2^k-1$
negative_passages.docid: 122149
negative_passages.text: How to prove that $\sum_{i<j}(X_i-X_j)^2=n\sum_{i=1}^{n}(X_i-\bar{X})^2$
negative_passages.docid: 33104
negative_passages.text: Combinatorial Proof with Summation Identity
negative_passages.docid: 69131
negative_passages.text: Different proofs of $\,a^n-b^n =(a-b)\sum_{i=0}^{n-1} a^i b^{n-1-i} $?
negative_passages.docid: 99001
negative_passages.text: General identity for a double summation theorem
negative_passages.docid: 155014
negative_passages.text: How to justify the definition of summation $s_n=\sum_{i=1}^n a_i=a_1+\cdots+a_n$?
negative_passages.docid: 143365
negative_passages.text: Is $\sum_{i=1}^{n-1}i=\binom{n}{2}$?
negative_passages.docid: 67454
negative_passages.text: Show that $\sum_{i=1}^n (x_i - \bar{x})(y_i - \bar{y}) = \sum_{i=1}^n (x_i - \bar{x})(y_i)$.
negative_passages.docid: 142132
negative_passages.text: How do you prove $\sum \frac {n}{2^n} = 2$?
negative_passages.docid: 110790
negative_passages.text: Prove the following summation inequality: $\sum_{i=1}^n(a_i)\sum_{i=1}^n(\frac{1}{a_i})\ge n^2$
negative_passages.docid: 67271
negative_passages.text: $\sum_{n=-\infty}^{\infty}\frac{1}{(u +n)^2}=\frac{\pi^2}{(\sin \pi u)^2}$
negative_passages.docid: 14968
negative_passages.text: How $\frac{1}{n}\sum_{i=1}^n X_i^2 - \bar X^2 = \frac{\sum_{i=1}^n (X_i - \bar X)^2}{n}$
negative_passages.docid: 118471
negative_passages.text: Prove that $1-\sum_{i=1}^n a_i < \prod_{i=1}^n(1-a_i) $
negative_passages.docid: 50226
negative_passages.text: Prove the identity $\sum_{k=0}^{n}\sum_{r=0}^{k} \binom{k}{r} \binom{n}{k} = 3^n$
negative_passages.docid: 145900
negative_passages.text: Proof of a double summation reduction identity