Newbetuts
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New posts in real-analysis
Mistake in proof of Lemma 2.3 in Chapter 3 of Stein and Shakarchi's Fourier Analysis
real-analysis
analysis
fourier-analysis
fourier-series
If $f : A \to B$ and $B$ is countable, given that $f$ is surjective, $A$ is countable.
real-analysis
elementary-set-theory
Elementary proof of $f>0$ implies $\int f>0$?
real-analysis
If $f$ is integrable, then I can bring continuous functions from above or below
real-analysis
integration
riemann-integration
Theorem 6.16 in Baby Rudin: $\int_a^b f d \alpha = \sum_{n=1}^\infty c_n f\left(s_n\right)$
real-analysis
integration
analysis
proof-verification
definite-integrals
An inverse question inspired by Cauchy–Schwarz inequality [duplicate]
real-analysis
sequences-and-series
inequality
Characterization of $C^{k,\alpha}$ (functions with Hölder continuous derivatives) through Taylor estimates
real-analysis
derivatives
holder-spaces
stochastic-pde
Is there a variant of the implicit function theorem covering a branch of a curve around a singular point?
real-analysis
sequences-and-series
complex-analysis
algebraic-geometry
implicit-function-theorem
Do any authors take the sheaf-theoretic viewpoint on multivalued functions and/or indefinite integrals?
calculus
real-analysis
complex-analysis
sheaf-theory
multivalued-functions
What uniquely characterizes the germ of a smooth function?
calculus
real-analysis
taylor-expansion
analyticity
analytic-functions
$f$ is uniformly continuity
real-analysis
continuity
uniform-continuity
Can we approximate a.e. invertible matrices with everywhere invertible matrices in $L^2$ sense?
real-analysis
measure-theory
determinant
lp-spaces
perturbation-theory
Proving monotonicity of this ratio of Hypergeometric functions
real-analysis
gamma-function
interpolation
hypergeometric-function
monotone-functions
How should I prove $\lim_{x \to \infty} \frac{1}{x^3} = 0$
real-analysis
limits
epsilon-delta
Second derivative of mollification at local maximum
real-analysis
calculus
partial-differential-equations
Gradient nonzero extensions of a vector field on the circle
real-analysis
differential-topology
A travelled inequality found by discriminant
real-analysis
irreducible-polynomials
constants
discriminant
buffalo-way
Convergence of $\sum_{n=1}^\infty (-1)^n(\sqrt{n+1}-\sqrt n)$
real-analysis
sequences-and-series
Riesz Representation Theorem for $\ell^p$
real-analysis
functional-analysis
lp-spaces
riesz-representation-theorem
Showing that $\sin(\sqrt{4 \pi^{2}n^{2} + x})$ converges uniformly on $[0,1]$
real-analysis
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