Reputation
2,048
Next privilege 2,500 Rep.
Create tag synonyms
Badges
6 30
Newest
 Yearling
Impact
~48k people reached

Aug
20
awarded  Yearling
Aug
7
comment Why $\phi(H) \cong H/ \ker\phi$ in the Second Isomorphism Theorem?
It says it in the statement of the first theorem.
Aug
2
comment Permutations of the elements of $\mathbb Z_p$
What have you tried so far?
Aug
2
reviewed Approve Showing three points are collinear
Jul
21
comment a GRE question about ring theory, how can I know which one is correct?
This and @DerekHolt information should be enough to answer the question.
Jul
21
comment a GRE question about ring theory, how can I know which one is correct?
$\{0\}$ and $R$ are ideals for every ring $R$.
Jul
11
comment Proving linearity of derivative
It must be a linear function. Otherwise, the linear approximation formula doesn't make any sense.
Jun
18
comment Math Problem Help || Trig (Updated picture)
This hurts my eyes.
Jun
18
comment Palindromic numbers, and $3$.
Nothing about this question makes sense.
Jun
18
comment Palindromic numbers, and $3$.
Even more furthermore, if $x$ is a palindromic number, it's still not true :p
Jun
18
comment Palindromic numbers, and $3$.
Did you mean to apply this to palindromic numbers?
Jun
18
answered Palindromic numbers, and $3$.
May
11
comment How to find the maximum value subject to constraints
This is definitely in either your textbook or class.
Apr
18
comment Continuity of integral from x to x+1 of Lp function
Hint : Holder .
Mar
24
comment Wave equation in three space dimensions
The dot just means the $x$ variable. As you can see, the estimate only depends on the $t$ slice.
Mar
8
comment How do none of the of the polynomials have a degree 2?
It is definitely wrong because $x^2$ is a degree 2 polynomial!
Mar
6
comment How to handle derivative of absolute value?
Please look up the definition of weak derivative. The function might have a derivative in this sense.
Mar
6
comment Two norms $||.||_1$ and $||.||_2$ on a vector space $V$ are equivalent.
This question has been answered at least 50 times on this site.
Mar
6
comment Find the limit of $\lim\limits_{x\rightarrow0}\frac{x}{\tan x}$.
It was wrong. Now it's correct.
Mar
6
comment Find the limit of $\lim\limits_{x\rightarrow0}\frac{x}{\tan x}$.
False? ${}{}{}{}$