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Apr
18
awarded  Nice Answer
Apr
2
awarded  Necromancer
Mar
23
revised Lebesgue integral - area under the curve
deleted 1 character in body
Mar
4
revised How to prove the following formula is a constant?
deleted 34 characters in body
Mar
3
answered How to prove the following formula is a constant?
Mar
3
comment How to prove the following formula is a constant?
what if you change variable in the integrals and let $x=\rho y$?
Mar
1
revised Riemann integration of an odd function
added 2 characters in body
Feb
24
awarded  Revival
Jan
23
awarded  Yearling
Jan
11
comment Showing that if a function is $O(x^2)$, then it's also $o(x)$
For $x \to a\neq 0$ you have $O(x^2) = O(1)$ and $o(x) = o(1)$. And yes, they are different.
Jan
8
answered Why is it unacceptable to say “the range is a function of the domain”?
Jan
7
comment Showing that if a function is $O(x^2)$, then it's also $o(x)$
Whatever is $C$ one has that $C|x|\to 0$ as $x\to 0$.
Jan
7
comment A positive measurable and improper integrable function is integrable
yes, it is correct.
Jan
7
comment A positive measurable and improper integrable function is integrable
We can but not have to.
Jan
7
answered A positive measurable and improper integrable function is integrable
Jan
7
answered Showing that if a function is $O(x^2)$, then it's also $o(x)$
Jan
7
comment Rational and irrational numbers under base pi
I don't know. But here en.wikipedia.org/wiki/Non-integer_representation you find some references.
Jan
7
revised Rational and irrational numbers under base pi
added 156 characters in body
Dec
31
revised How to solve the integral $\int\frac{x-1}{\sqrt{ x^2-2x}}dx $
deleted 1 character in body
Dec
31
answered Impossible events that actually happened