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All questions asked by cyndy

List all solved & unsolved questions asked by cyndy

Is my kimchi still okay?

3   Seasoned Advice Asked on 07/10/2021

fermentation  kimchi 

Can't argue with success? Looking for "bad math" that "gets away with it"

41   Mathematics Asked on 01/07/2022

big list  examples counterexamples 

The topology generated by open intervals of rational numbers

1   Mathematics Asked on 01/07/2022

general topology  rational numbers  real numbers 

If the solutions of $X'=AX$ have a constant norm then $A$ is skew symmetric.

3   Mathematics Asked on 01/07/2022

ordinary differential equations 

An interesting identity involving the abundancy index of divisors of odd perfect numbers

1   Mathematics Asked on 01/07/2022

arithmetic functions  divisor sum  number theory  ordinary differential equations  perfect numbers 

Prove the series converges almost everywhere

1   Mathematics Asked on 01/07/2022

lebesgue integral  measure theory  real analysis  sequences and series 

Prove that the functional in $C_c^0(Omega)$ is a Radon measure

1   Mathematics Asked on 01/07/2022

continuity  distribution theory  measure theory  sobolev spaces  topological vector spaces 

How can I evaluate ${lim_{hto 0}frac{cos(pi + h) + 1}{h}}$?

4   Mathematics Asked on 01/07/2022

calculus  limits  trigonometry 

Estimate $f(b)$ using Taylor Expansion for $f'(x) = cos(x^2)$

1   Mathematics Asked on 01/07/2022

approximation  calculus  derivatives  taylor expansion 

If $f ∈ C^∞(M)$ has vanishing first-order Taylor polynomial at $p$, is it a finite sum of $gh$ for $g, h ∈ C^∞(M)$ that vanish at $p$?

1   Mathematics Asked on 01/07/2022

differential geometry  manifolds  smooth manifolds  taylor expansion 

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