Question

Understanding last step of OLS estimator variance proof

score 92 · Answer 1 · 2026-04-17 03:08:04

Understanding last step of OLS estimator variance proof

Published on 17 Apr 2026 - 3:08

score 156 · Answer 2 · 2026-04-16 09:05:34

Trouble understanding proof of the inequality - $(\frac{1}{a}+1)(\frac{1}{b}+1)(\frac{1}{c}+1) \ge 64 $, for $a,b,c > 0$ and $a+b+c = 1$

score 227 · Answer 3 · 2026-04-08 03:38:06

227

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Confused about Tangent Space being well-defined

Published on 08 Apr 2026 - 3:38

score 91 · Answer 4 · 2026-04-16 15:06:34

91

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trouble understanding proof for the inequality: $\frac{a}{(a+1)(b+1)}+\frac{b}{(c+1)(b+1)}+\frac{c}{(a+1)(c+1)} \ge \frac{3}{4}$

Published on 16 Apr 2026 - 15:06

score 23k · Answer 5 · 2026-04-16 09:54:42

23k

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Proofs of determinants of block matrices

Published on 16 Apr 2026 - 9:54

score 1.3k · Answer 6 · 2026-04-12 01:43:34

1.3k

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Proof of Gibbs' inequality

Published on 12 Apr 2026 - 1:43

score 419 · Answer 7 · 2026-04-11 22:01:01

419

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Explanation of the last step in this proof of Lucas' theorem

Published on 11 Apr 2026 - 22:01

score 2.4k · Answer 8 · 2026-04-10 17:37:17

2.4k

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Proof that linearly dependent rows/columns of $A \implies \det(A) = 0$

Published on 10 Apr 2026 - 17:37

score 26 · Answer 9 · 2026-04-13 00:35:47

26

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proving finite operation

Published on 13 Apr 2026 - 0:35

score 64 · Answer 10 · 2026-04-14 06:57:22

64

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Why can't Bolzano-Weierstrass be proved by choosing peak element and then iteratively peak of sequence after last peak?

Published on 14 Apr 2026 - 6:57

score 193 · Answer 11 · 2026-05-11 08:33:42

193

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Spivak Calculus - Ch. 1 ex 5.8 : multiplication respects field ordering

Published on 11 May 2026 - 8:33

score 167 · Answer 12 · 2026-04-14 01:19:22

167

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Proposition 8 Chapter 3 Real Analysis Royden

Published on 14 Apr 2026 - 1:19

score 214 · Answer 13 · 2026-04-16 18:47:21

214

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Proof that the Number of Maximal Chains of $℘(S)$ Containing $X ⊆ S$ where $|S|=n$ and $|X|=s$ is $s!(n-s)!$

Published on 16 Apr 2026 - 18:47

score 52 · Answer 14 · 2026-04-14 02:12:30

52

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A question on the proof of the inequality $ \sum_{k} |I_{k}| \leq |I| $, where $ I $ and the $ I_{k} $’s are intervals.

Published on 14 Apr 2026 - 2:12

score 112 · Answer 15 · 2026-04-13 04:02:31

112

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Help with proof by induction problem

Published on 13 Apr 2026 - 4:02

List Question

Understanding last step of OLS estimator variance proof

Trouble understanding proof of the inequality - $(\frac{1}{a}+1)(\frac{1}{b}+1)(\frac{1}{c}+1) \ge 64 $, for $a,b,c > 0$ and $a+b+c = 1$

Confused about Tangent Space being well-defined

trouble understanding proof for the inequality: $\frac{a}{(a+1)(b+1)}+\frac{b}{(c+1)(b+1)}+\frac{c}{(a+1)(c+1)} \ge \frac{3}{4}$

Proofs of determinants of block matrices

Proof of Gibbs' inequality

Explanation of the last step in this proof of Lucas' theorem

Proof that linearly dependent rows/columns of $A \implies \det(A) = 0$

proving finite operation

Why can't Bolzano-Weierstrass be proved by choosing peak element and then iteratively peak of sequence after last peak?

Spivak Calculus - Ch. 1 ex 5.8 : multiplication respects field ordering

Proposition 8 Chapter 3 Real Analysis Royden

Proof that the Number of Maximal Chains of $℘(S)$ Containing $X ⊆ S$ where $|S|=n$ and $|X|=s$ is $s!(n-s)!$

A question on the proof of the inequality $ \sum_{k} |I_{k}| \leq |I| $, where $ I $ and the $ I_{k} $’s are intervals.

Help with proof by induction problem

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