List questions from real-analysis

Published on 10 Apr 2026 - 1:30

226

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Seeking an example of Schwartz function $f$ such that $ \int_{\bf R}\left|\frac{f(x-y)}{y}\right|\ dy=\infty$

Published on 09 Apr 2026 - 23:12

152

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Supremum of Sumset (Proof Writing)

Published on 10 Apr 2026 - 1:11

14.2k

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Find the equation of tangent line to the intersection of the two surfaces in $P(4,-2,20)$ $z=x^2+y^2 \,\,,\,z=2x+4y+20$

Published on 10 Apr 2026 - 2:54

146

Views

Calculation on gradient of the dot product on $\mathbb R^n$

Published on 25 Mar 2026 - 3:20

51

Views

Does this set have a maximum?

Published on 09 Apr 2026 - 20:03

781

Views

Approximating derivative of Dirac delta function using mollifiers

Published on 09 Apr 2026 - 1:54

70

Views

property of Hamel bases

Published on 09 Apr 2026 - 12:01

122

Views

Characterization of spherically symmetric functions

Published on 02 Apr 2026 - 0:49

3.5k

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If a set is open, does it mean that every point is an interior point?

Published on 10 Apr 2026 - 5:35

41

Views

question about a continuous function and uniform convergence

Published on 09 Apr 2026 - 19:33

1.7k

Views

Proof; Log Convex implies Convexity

Published on 05 Apr 2026 - 19:36

454

Views

Method for evaluating Darboux integrals by a sequence of partitions?

Published on 09 Apr 2026 - 1:00

56

Views

Trying to define the set of alternate derivatives associated with the set of periodic functions with some rational number period

Published on 10 Apr 2026 - 8:25

363

Views

Understanding the essential range

Published on 10 Apr 2026 - 15:55

List Question

Prove $f(x,y)$ is continuous or not continuous.

Seeking an example of Schwartz function $f$ such that $ \int_{\bf R}\left|\frac{f(x-y)}{y}\right|\ dy=\infty$

Supremum of Sumset (Proof Writing)

Find the equation of tangent line to the intersection of the two surfaces in $P(4,-2,20)$ $z=x^2+y^2 \,\,,\,z=2x+4y+20$

Calculation on gradient of the dot product on $\mathbb R^n$

Does this set have a maximum?

Approximating derivative of Dirac delta function using mollifiers

property of Hamel bases

Characterization of spherically symmetric functions

If a set is open, does it mean that every point is an interior point?

question about a continuous function and uniform convergence

Proof; Log Convex implies Convexity

Method for evaluating Darboux integrals by a sequence of partitions?

Trying to define the set of alternate derivatives associated with the set of periodic functions with some rational number period

Understanding the essential range

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