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12 Questions

views newest activity votes

3

votes

2

answers

91

views

X is a compact metric space, which of the following must be true?

real-analysis general-topology

apr 8 at 11:16 Ittay Weiss 18.9k

2

votes

0

answers

36

views

Is this pointwise convergence sequence also uniform convergence?

calculus sequences-and-series limit integration convergence

apr 6 at 15:49 frame99 115

1

vote

2

answers

50

views

Is the preimage of null set with a function from $\Bbb R$ to $\Bbb R$ also a null set?

real-analysis general-topology

mar 28 at 10:25 Arthur Fischer♦ 21.3k

1

vote

2

answers

117

views

How to prove the topological space is not metrizable？

general-topology

mar 16 at 16:45 GEdgar 19k

1

vote

1

answer

80

views

How to calculate $\int \dfrac {e^{t}} {1+t}dt$

calculus differential-equations

feb 28 at 15:56 Ishan Banerjee 3,747

1

vote

1

answer

98

views

How to find interior, closure, limit points, and isolated points of subsets of $\mathbb{R}$?

general-topology

feb 12 at 6:29 Brian M. Scott 154k

1

vote

1

answer

90

views

Homework for Hahn-Banach theorem.Boundedness of $\overline {f}$

homework functional-analysis

dec 25 at 15:12 frame99 115

1

1

vote

0

answers

60

views

A Problem for measure function $n(y)$，the number of solution

real-analysis measure-theory

dec 12 at 17:26 frame99 115

1

1

vote

1

answer

75

views

$x^{6}+30x^{5}-15x^{3}+6x-120$can't be written as products of two polynomials of rational coefficients and positive degrees.

number-theory polynomials

dec 12 at 15:48 Makoto Kato 11.3k

0

votes

0

answers

16

views

How to find the C satisfied $\left| y\left( t\right) \right| < Ct$

differential-equations

jan 9 at 13:55 frame99 115

-1

votes

2

answers

176

views

Prove that a group of order 150 is not simple.

abstract-algebra group-theory

dec 12 at 19:24 hmmmm 1,141

1

-1

votes

1

answer

190

views

Prove $\sup \left| f'\left( x\right) \right| ^{2}\leqslant 4\sup \left| f\left( x\right) \right| \sup \left| f''\left( x\right) \right| $

calculus real-analysis functions inequality derivatives

dec 12 at 15:00 Davide Giraudo 56.2k

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