Question

Prove that $(x+y)\left(\frac{1}{x}+\frac{4}{y}\right)\ge9,$ if $x,y >0.$

score 85 · Answer 1 · 2026-04-15 18:11:08

85

Views

Prove that $(x+y)\left(\frac{1}{x}+\frac{4}{y}\right)\ge9,$ if $x,y >0.$

Published on 15 Apr 2026 - 18:11

score 68 · Answer 2 · 2026-03-27 08:39:03

68

Views

Riez representation theorem proof explanation

Published on 27 Mar 2026 - 8:39

score 45 · Answer 3 · 2026-04-16 16:45:25

45

Views

Why the answer in the linked question is treating the integral as Riemann integral and not Lebesgue ones?

Published on 16 Apr 2026 - 16:45

score 642 · Answer 4 · 2026-04-15 08:26:06

642

Views

Proof By ContraPositive: if xy is odd, then x is odd and y is odd

Published on 15 Apr 2026 - 8:26

score 144 · Answer 5 · 2026-04-15 20:31:17

144

Views

What am I missunderstanding for the definition of the $i$-th face map of an $n$-simplex?

Published on 15 Apr 2026 - 20:31

score 1k · Answer 6 · 2026-04-11 13:20:54

1k

Views

About the proof of inner product space(uniqueness of y)

Published on 11 Apr 2026 - 13:20

score 702 · Answer 7 · 2026-04-10 01:15:23

702

Views

In a process of proof ; unbiased estimator of the covariance

Published on 10 Apr 2026 - 1:15

score 43 · Answer 8 · 2026-04-11 23:34:52

Help on understanding the proof of measurability of a function specifying only a class of sets that generates the Borel sigma algebra

score 64 · Answer 9 · 2026-04-16 03:42:55

64

Views

Unclear claim in Serre's Lie algebras and Lie groups 1964 Lectures

Published on 16 Apr 2026 - 3:42

score 59 · Answer 10 · 2026-04-09 19:00:37

59

Views

Question about the definition of direct sum of subspaces

Published on 09 Apr 2026 - 19:00

score 120 · Answer 11 · 2026-03-25 16:08:19

120

Views

Coalgebras and Coideals: Why does $\ker(\pi \otimes \mathrm{id}_C ) = I \otimes C$ hold?

Published on 25 Mar 2026 - 16:08

score 132 · Answer 12 · 2026-04-14 11:55:01

132

Views

The meaning of $\ast$ in $\{0,1\}^\ast$ and of $\lambda$ such that $\forall x\in\{0,1\}^\ast$ we have $\lambda x=x$.

Published on 14 Apr 2026 - 11:55

score 80 · Answer 13 · 2026-03-27 13:02:35

80

Views

Existence of certain factorization of simplicial map

Published on 27 Mar 2026 - 13:02

score 94 · Answer 14 · 2026-04-15 12:13:58

94

Views

If $x$ is known to be a negative number is $\sqrt{x^2}=-x$?

Published on 15 Apr 2026 - 12:13

score 1k · Answer 15 · 2026-04-15 05:39:58

1k

Views

Let $V$ be an inner product space and $T\colon V\to V$ a linear operator. Prove that $R(T^{*})^{\bot}=N(T)$.

Published on 15 Apr 2026 - 5:39

List Question

Prove that $(x+y)\left(\frac{1}{x}+\frac{4}{y}\right)\ge9,$ if $x,y >0.$

Riez representation theorem proof explanation

Why the answer in the linked question is treating the integral as Riemann integral and not Lebesgue ones?

Proof By ContraPositive: if xy is odd, then x is odd and y is odd

What am I missunderstanding for the definition of the $i$-th face map of an $n$-simplex?

About the proof of inner product space(uniqueness of y)

In a process of proof ; unbiased estimator of the covariance

Help on understanding the proof of measurability of a function specifying only a class of sets that generates the Borel sigma algebra

Unclear claim in Serre's Lie algebras and Lie groups 1964 Lectures

Question about the definition of direct sum of subspaces

Coalgebras and Coideals: Why does $\ker(\pi \otimes \mathrm{id}_C ) = I \otimes C$ hold?

The meaning of $\ast$ in $\{0,1\}^\ast$ and of $\lambda$ such that $\forall x\in\{0,1\}^\ast$ we have $\lambda x=x$.

Existence of certain factorization of simplicial map

If $x$ is known to be a negative number is $\sqrt{x^2}=-x$?

Let $V$ be an inner product space and $T\colon V\to V$ a linear operator. Prove that $R(T^{*})^{\bot}=N(T)$.

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