143 reputation
7
bio website
location Moscow, Russia
age 29
visits member for 2 years, 5 months
seen Aug 6 '13 at 11:36

My language of choice is Python. I'm really fond of this language, especially for its eloquence.

I made some projects in Java.

Wrote a few things in JavaScipt (in some aspects it's quite interesting language! )

Also I have some knowledge of C++, still don't have much experience in it.

Just for those who are interested, my profile in LinkedIn: http://www.linkedin.com/pub/oleg-golovin/24/307/848


Aug
6
awarded  Popular Question
Dec
19
revised Calculating coefficients of generating function
added 106 characters in body
Dec
19
comment Calculating coefficients of generating function
But yes, conv is much closer to numeric calculation of the probabilities than resorting to numeric approximate calculations of derivatives of the generating function as suggested in the other answer.
Dec
19
comment Calculating coefficients of generating function
Thank you! This it closer to an answer I would like to accept. Still, I expect that there could be a way to completely get rid of generating function (as I understand it's designed just to simplify things for those who make by-hand calculations), as there might be other formulas using for example binomial coefficients (it's just a guess).
Sep
29
revised Calculating coefficients of generating function
added 1 characters in body
Sep
29
asked Calculating coefficients of generating function
Dec
19
awarded  Self-Learner
Nov
1
comment Is the rank of $AB$ always equal to the rank of $BA$?
Thank you for the answer. I even started watching videos on the Khan Academy site about the nullspace of a matrix after reading you answer! After watching this video I'll recur to your answer and hope I'll managed to grasp it completely.
Nov
1
awarded  Scholar
Nov
1
accepted Is the rank of $AB$ always equal to the rank of $BA$?
Nov
1
comment Is the rank of $AB$ always equal to the rank of $BA$?
@Phira My lack of ability to anderstand was primarily connected with the terms in English which I couldn't comprehend (English is not my native language): "full rank", "regard" in this meaning, finite sets; cardinality; dimensions. I may know these terms in my native language, but here in English they were beyond my ability to comprehend. Now with Gerry Myerson's explanation I seem to understand that the order of function application matters and the size of resultant range may differ.
Nov
1
comment Is the rank of $AB$ always equal to the rank of $BA$?
@GerryMyerson Thank you. I seem to understand now.
Nov
1
awarded  Teacher
Nov
1
comment Is the rank of $AB$ always equal to the rank of $BA$?
@Phira I can barely understand what you write.
Oct
31
comment Is the rank of $AB$ always equal to the rank of $BA$?
@AndréNicolas Thanks! I updated the answer. It worked. The only thing left that I can't understand is why the rank changes.
Oct
31
awarded  Editor
Oct
31
revised Is the rank of $AB$ always equal to the rank of $BA$?
added 62 characters in body
Oct
31
comment Is the rank of $AB$ always equal to the rank of $BA$?
@JasonDeVito Thanks for the hit. I made an answer basing on it. Still, I want some intuition why it's so. We can look on the first matrix in a multiplication as on some operator. And why if A operates on B the rank is r1 and when B operates on A is r2, and r1 is not equal to r2. The proof is a good thing, but it'll be forgotten over time. And only intuition is what will be carried over time.
Oct
31
awarded  Student
Oct
31
answered Is the rank of $AB$ always equal to the rank of $BA$?