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Mathematics
BML's user avatar
BML's user avatar
BML's user avatar
BML
  • Member for 3 years, 11 months
  • Last seen more than a month ago
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About

I really like mathematics, and I am passionate about solving problems, my area of interest is analysis and code theory.

"Mathematicians are the guardians of mathematics" LBM

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question
7
Solve the equation: $\lfloor a/2\rfloor+\lfloor a/3\rfloor+\lfloor a/5\rfloor=a$, where $a> 0$.
Feb 6, 2021
question
4
Calculate the integral $ \iint_R\sqrt{y/x}\,e^{\sqrt{xy}}\,dA$
Feb 11, 2021
question
3
$\sum_{d\mid n}\lambda(d)\sigma(d)=n\lambda(n)\sum_{d^2\mid n}\frac{1}{d^2}$ Solution
Jan 9, 2021
question
2
Determine the domain of the function $g(x, y, z)=\ln(16-4x^2-4y^2-z^2)$.
Aug 7, 2021
answer
2
Find the limit $\lim_{(x,y,z)\to(0,0,0)}\frac{xy+xz+yz}{x^2+y^2+z^2}$
Feb 10, 2021
answer
2
Proving that if $\sum \frac{a_{n+1}}{a_n}$ converges, then so is $\sum a_n$
Jul 7, 2021
question
1
Any positive integer greater than $11$ is a nonnegative linear combination of $5$ and $4$. My solution [duplicate]
Jan 31, 2021
question
1
Prove that $(n+1)a\leq a^{n+1}+n, \forall a,n\in\mathbb{N}$.
Jun 30, 2021
question
1
Let $f(x,y)=\sqrt{x}+\sqrt{y}+\sqrt {z}+\ln(4-x^2-y^2-z^2)$. Determine and describe the domain of $f$.
Jul 29, 2021
question
1
Draw a contour map of the function $f(x,y)=\sqrt{y^2-x^2}$, showing several contour lines.
Aug 16, 2021