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hal4math's user avatar
hal4math's user avatar
hal4math
  • Member for 4 years, 9 months
  • Last seen this week
10 votes

How to learn without looking at solutions? (real analysis)

7 votes
Accepted

Basis for the Tangent space and derivations at a point

5 votes
Accepted

Is it okay if I am slow in reading math?

4 votes

Composition of multivariate functions.

3 votes

Why do you need Jacobian determinant to change variables in Vector Integral?

3 votes
Accepted

What does it mean by "there is a unique linear norm preserving extension $f$ of $g$ on $H$"?

3 votes

Difference between a vector function and parametric equations

3 votes
Accepted

Applying discrete calculus to prove the results of the classical calculus

2 votes
Accepted

Intuition on why Reflexive Spaces are Important

2 votes
Accepted

Baby Rudin theorem 10.33 ( STOKES' THEOREM)

2 votes
Accepted

Convolution a Schwartz function and a rapidly decreasing function

2 votes
Accepted

Integral of multivariate derivative.

2 votes
Accepted

Set theory. What are the best interpretations of a countable set.

2 votes
Accepted

How do I simplify this matrix equation?

2 votes

Help showing that $g(x)$ is differentiable.

2 votes
Accepted

show that $f(r) = \frac{1}{\mathrm{area}(S_r)} \int_{S_r} u^2 dS$ is increasing, when $u$ is harmonic

2 votes
Accepted

Let $V = C^{\infty}(\mathbb{R},\mathbb{R})$ and $T \in L(V)$ defined by $(T(f))(t)=tf(t)$. Prove that $T$ has no eigenvalues.

2 votes

Definition of a Subharmonic Function

2 votes

Are $\xi \cdot \hat{u}(\xi)$ and $e^x \cdot u(x)$ bounded in $\mathbb{R}$?

2 votes

uniform continuity of $f$ on $[0,\infty)$ when $\lim_{x\rightarrow\infty}f(x)/x=1$.

1 vote
Accepted

Maximal function of $\frac{1}{|x|^a}, x \in \Bbb{R}^d$ for $0<a<d$

1 vote

Why do these integration steps hold true?

1 vote

compute the limit of $xy(x+y-2)$ as $(x,y)$ approaches infinity for two domains

1 vote
Accepted

Chain rule for functions of d variables

1 vote

Is a ball in Sobolev space $W^{2,2}(\Bbb R)$ closed in $L^2(\Bbb R)$?

1 vote
Accepted

Total derivative only defined on open subset

1 vote

Can $f(x)=x$ ever be an injective function but not a surjective function, if we restrict the domain of $f$?

1 vote
Accepted

Cauchy sequences of real and rationals

1 vote

Is it possible to find the derivative of $y = 2^x$ using Calculus Made Easy-style infinitesimals?

1 vote

Show that $\exists \rho\in (a,b)$ such that $f(\rho)\le f(x)$ forall $ x\in (a,b)$.