Question

Using Variation of Parameters to Find the General Solution of $u''-u=\frac{2}{e^x+1}$

score 120 · Answer 1 · 2018-08-05 11:46:12

120

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Using Variation of Parameters to Find the General Solution of $u''-u=\frac{2}{e^x+1}$

Published on 05 Aug 2018 - 11:46

score 141 · Answer 2 · 2026-03-28 13:59:16

141

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score 1.5k · Answer 3 · 2026-04-05 20:25:48

1.5k

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score 148 · Answer 4 · 2026-03-27 21:36:26

148

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Show that:$\sum_{i=1}^n x_{i} \cdot \sum_{i=1}^n \frac{1}{x_{i}} \geq n^2 $

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score 122 · Answer 5 · 2026-03-27 05:37:41

122

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Putnam and Beyond (Methods of proof) Problem 20

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score 71 · Answer 6 · 2026-03-25 03:04:19

71

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score 212 · Answer 7 · 2026-03-26 22:58:27

212

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score 190 · Answer 8 · 2026-03-29 03:36:09

190

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score 69 · Answer 9 · 2018-08-06 09:07:26

69

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score 136 · Answer 10 · 2018-08-06 12:58:53

136

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Prob. 5 (b), Sec. 4.3, in Bartle & Sherbert's INTRO TO REAL ANALYSIS: Rigorous Proof of a Limit Statement

Published on 06 Aug 2018 - 12:58

score 84 · Answer 11 · 2018-08-06 15:34:35

84

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score 731 · Answer 12 · 2018-08-06 22:52:23

731

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394

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score 156 · Answer 14 · 2018-08-07 01:25:05

156

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score 52 · Answer 15 · 2026-03-29 04:48:07

52

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Methods of showing Field Extensions are equal

Published on 29 Mar 2026 - 4:48

List Question

Using Variation of Parameters to Find the General Solution of $u''-u=\frac{2}{e^x+1}$

Is my solution for this integral problem correct?

2 ways to find a Laurent series?

Show that:$\sum_{i=1}^n x_{i} \cdot \sum_{i=1}^n \frac{1}{x_{i}} \geq n^2 $

Putnam and Beyond (Methods of proof) Problem 20

Extending a ring hom from $R \to L$ to $K \to L$, where $K$ is fraction field of domain $R$.

Calculating $\int_{-\infty}^{\infty}\left( \frac{\cos{\left (x \right )}}{x^{4} + 1} \right)dx$ via the Residue Theorem?

Proof that my greedy algorithm for assigning candidates to jobs works

Proof verification of monotone functions $f: [a, b] \rightarrow \mathbb{R}$ are integrable

Prob. 5 (b), Sec. 4.3, in Bartle & Sherbert's INTRO TO REAL ANALYSIS: Rigorous Proof of a Limit Statement

Proof checking: uniqueness and family of sets

Complete proof about the limits of a multivariable function

About a uniformly integrable sequence of functions

Prove $f$ is identically $0$ on $[0, 1]$

Methods of showing Field Extensions are equal

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