Feanor

Krakow, Poland

Age: 25

2d
asked The connection between roosters and genitalia
Oct
15
awarded Civic Duty
Oct
15
asked How to format bibligraphy when author changes names?
Oct
14
revised Does there exist an $a_0$ such that the sequence $a_{n+1} = 2a_n + 1$ is prime for all $n \ge 0$?
added 427 characters in body
Oct
14
answered Does there exist an $a_0$ such that the sequence $a_{n+1} = 2a_n + 1$ is prime for all $n \ge 0$?
Oct
13
awarded Popular Question
Oct
13
awarded Nice Question
Oct
13
asked Is it unprofessional to use graphics from Wikipedia in a poster?
Oct
11
comment Do better than chance
Perhaps it would be better to say that the opponent draws a line of a given length instead of writing a number. It seems to avoid various loopholes more easily (it is clear that we may assume wlog that all numbers are from (0,1).).
Oct
10
awarded Supporter
Oct
5
comment Calculate the dimension of a space of operators
@LuizCordeiro Thanks! You're right, my bad. You can adapt to use $h^2$ without much trouble.
Oct
5
revised Calculate the dimension of a space of operators
added 124 characters in body
Oct
5
asked Do zodiac signs correlate with personality traits?
Oct
5
comment Fractions and big $O$ notation.
In the comment above, you can in fact take $g(z) = f(z) + O(z^{2n})$, meaning that $g(z) = f(z) + h(z)$ with some $h$ in $O(z^{2n})$.
Oct
5
comment Fractions and big $O$ notation.
I suppose it formally means that if $f(z)$ is $O(z^n)$ then $\frac{1}{1-f(z)} = 1 + g(z)$ where $g(z)$ is some function in $O(z^n)$ (and of course $g$ depends on the choice of $f$).
Oct
5
revised Calculate the dimension of a space of operators
added 19 characters in body
Oct
5
revised Calculate the dimension of a space of operators
added 1135 characters in body
Oct
4
answered Calculate the dimension of a space of operators
Oct
4
revised What are the advantages of using f(x) instead of y=x.
added 266 characters in body
Oct
4
answered What are the advantages of using f(x) instead of y=x.
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