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May
11
reviewed Close What is the maximal path of a tree?
May
11
reviewed Leave Open On the existence of a non-regular language $L$ such that $L^2\in \text{Reg}$?
May
11
reviewed Leave Open Prove that one series converges and that the other diverges ..
May
11
reviewed Leave Open Solving $T(n) = 3T(n-1)$
May
11
comment How do I prove this function is monotonic?
Monotonic only implies one-to-one if the function is continuous.
May
10
comment Why is this proof of $i = -1$ wrong?
@user86418 Fair enough, I was sensitive because of the very negative response this question is getting outside of your comment.
May
10
comment Why is this proof of $i = -1$ wrong?
@user86418 Which similar questions are these, and how do you propose the OP should have gone about finding them? Look up "false proof" and sift through the hundreds of questions in case one of them happens to be the exact same one as in this question?
May
9
awarded  Nice Answer
May
9
comment Is there any way to define arithmetical multiplication as other thing than repeated addition?
@YoTengoUnLCD Because $f(n)=f(1+1+...+1)=f(1)+...+f(1)$ is completely determined by the value of $f(1)$.
May
9
answered Is there any way to define arithmetical multiplication as other thing than repeated addition?
May
9
answered Please clear up this misunderstanding I have involving limits.
May
9
revised Please clear up this misunderstanding I have involving limits.
added 15 characters in body
May
8
comment Mathematics that is not taught in college
Continued fractions, projective geometry and quaternions spring to mind.
May
8
answered Why are both of the conditions of Bolzano -Weierstrass theorem necessary?
May
8
comment Ideals - A Geometric Interpretation?
Sure your picture illustrating normal subgroups is valid for ideals as well.
May
8
comment Why is there no explicit formula for the factorial?
The sum of the first $n$ integers takes us from addition up to the next operator, multiplication. So it seems reasonable to look for a formula for $n!$ involving exponentiation.
May
7
comment Why is it important, that mathematics can be formalized in set theory?
Philosophically, it's interesting that mathematics can be formalized at all. It tells us something about the relationship (or lack therefof) of mathematics to the real world.
May
7
comment Using of main theorems in differentiability.
@FaisalJamal Can you use the Intermediate Value Theorem to find a zero of $f(x+1)-f(x)$ in $[0, 1]$?
May
7
answered Using of main theorems in differentiability.
May
6
comment How to solve a system of linear equations using substitution or elimination
What do you mean when you say you keep getting a "graph answer"? Could you explain what you did?