BigbearZzz

United Kingdom

A foolish graduate student who wish to learn more from seasoned mathematicians here.

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How to use \includegraphics?

graphics packages asked Mar 30, 2016 at 5:18

tex.stackexchange.com

45 votes

Differential "Freshman's dream" for Laplacian operator.

real-analysis complex-analysis multivariable-calculus differential-geometry partial-differential-equations asked May 20, 2021 at 14:14

math.stackexchange.com

38 votes

How to justify solving $f(x+1) + f(x) = g(x)$ using this spectral-like method?

real-analysis functional-analysis operator-theory spectral-theory banach-algebras asked Jun 23, 2019 at 22:55

math.stackexchange.com

22 votes

Rigorous justification for this formal solution to $f(x+1)+f(x)=g(x)$

fa.functional-analysis real-analysis oa.operator-algebras sp.spectral-theory banach-algebras asked Jun 24, 2019 at 14:23

mathoverflow.net

17 votes

What is a Dynkin system? ($\lambda$-system)

real-analysis probability measure-theory descriptive-set-theory asked May 3, 2016 at 2:37

math.stackexchange.com

17 votes

Minkowski inequality $-$ Why should it follow from Holder's?

real-analysis functional-analysis inequality soft-question asked Sep 26, 2016 at 10:21

math.stackexchange.com

15 votes

Is $\int |x\rangle \langle x|dx$ Mathematical?

functional-analysis hilbert-spaces mathematical-physics distribution-theory spectral-theory asked Oct 4, 2015 at 1:04

math.stackexchange.com

13 votes

How weird can the boundary be so that the fundamental theorems of vector calculus hold?

integration multivariable-calculus differential-geometry pde vector-analysis asked Oct 15, 2017 at 23:11

math.stackexchange.com

13 votes

Covering a compact set with balls whose centers do not belong to other balls.

real-analysis general-topology measure-theory compactness asked May 16, 2019 at 23:28

math.stackexchange.com

12 votes

Precisely, what is the polar coordinate system?

geometry differential-equations multivariable-calculus differential-geometry riemannian-geometry asked Nov 15, 2017 at 12:08

math.stackexchange.com

Top Answers

Is there a simple function that generates the series; $1,1,2,1,1,2,1,1,2...$ or $-1,-1,1,-1,-1,1...$

math.stackexchange.com

What does a triple integral represent?

math.stackexchange.com

Why is $\log(1+e^x) - \frac{x}{2}$ even?

math.stackexchange.com

What are some easy but beautiful patterns in Pascal's Triangle?

math.stackexchange.com

Unions and intersections: $(A \cup B = A ∪ C) \land (A \cap B = A ∩ C) \implies B = C.$

math.stackexchange.com

What's the difference between "relation", "mapping", and "function"?

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What is wrong in this proof: That $\mathbb{R}$ has measure zero

math.stackexchange.com

Why "countability" in definition of Lebesgue measures?

math.stackexchange.com

Is this possible? AB- BA=I

math.stackexchange.com

Why do we need compactness?

math.stackexchange.com

Totally bounded and closed implies compact??

math.stackexchange.com

Why do they call it base 10?

math.stackexchange.com

Show that there does not exist a strictly increasing function $f : \mathbb Q \to \mathbb R$ such that $f(\mathbb Q) = \mathbb R$.

math.stackexchange.com

Why are all k-cells convex?

math.stackexchange.com

why area of triangle changes when measured as components of triangles?

math.stackexchange.com

Explaining Green's Theorem for Undergraduates

math.stackexchange.com

If A is infinite, does there have to exist a subset of A that is equivalent to A?

math.stackexchange.com

Definition of Infinite Nesting?

math.stackexchange.com

Is $\emptyset$ bounded? Why then $\inf \emptyset = \infty$ is reasonable?

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Examples of problems that are easier in the infinite case than in the finite case.

math.stackexchange.com

How can something be greater than $100\%$?

math.stackexchange.com

Assuming convergence of the following series, find the value of $\sqrt{6+\sqrt{6+\sqrt{6+...}}}$

math.stackexchange.com

Is $f(x) = e^x$ a Surjective function?

math.stackexchange.com

What's the midpoint of $[a,b)$?

math.stackexchange.com

Can a function be neither convex nor concave everywhere?

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How to reduce a polynomial to $2$ real polynomials?

math.stackexchange.com

Prove $(x_1+.....+x_n)^2 \leq n(x_1^2 + .....+x_n^2)$

math.stackexchange.com

Uniform Continuity on an unbounded domain

math.stackexchange.com

Proving the set of polynomials is dense in $C^{1}[0,1]$

math.stackexchange.com

Let $X \subseteq \Bbb Q^2$. Suppose each continuous function $f:X \to \Bbb R^2$ is bounded. Then $X$ is finite.

math.stackexchange.com