315 reputation
19
bio website
location Moscow, Russia
age
visits member for 1 year, 6 months
seen Jul 5 at 15:48

Jun
3
comment How many ways are there to represent the number $N$?
Well, that's what I got: rewrote equation $(1)$ in this way: $1091=10(100a_3+a_1)+(100a_2+a_0)$. $x=100a_3+a_1$, $y=100a_2+a_0$. Thus, $1091 = 10x+y. \ \ 0 \leq x \leq 109$. For every $x$ there is only one $y$, so we get $110$ ways to represent $N$.
Jun
2
asked How many ways are there to represent the number $N$?
Mar
18
accepted Find positive and negative indecies of inertia of a quadratic form
Mar
17
revised Find positive and negative indecies of inertia of a quadratic form
added 2 characters in body; edited title
Mar
17
asked Find positive and negative indecies of inertia of a quadratic form
Feb
23
comment A basis for a vector space
Thank you for your answers and sorry for any inconvenience. My English isn't perfect at all as it is not my native language.
Feb
23
accepted A basis for a vector space
Feb
23
revised A basis for a vector space
Rephrased
Feb
23
asked A basis for a vector space
Feb
23
comment solving $\sqrt{3-\sqrt{3+x}}=x$.
Finding the derivative should help to understand a behavior of the function, I think
Jan
23
accepted Find the smallest value of $a$ that a solution for this equation exists?
Jan
23
asked Find the smallest value of $a$ that a solution for this equation exists?
Jan
20
asked How to solve the following system with parametric equation?
Jan
16
accepted How to prove that a set of logical connectives is functionally complete(incomplete)?
Jan
14
comment How to prove that a set of logical connectives is functionally complete(incomplete)?
These are vectors of boolean functions
Jan
14
asked How to prove that a set of logical connectives is functionally complete(incomplete)?
Jan
14
revised Must a monotone function have a monotone derivative?
Deleted links, added images, fixed grammar
Jan
14
awarded  Student
Jan
14
awarded  Scholar
Jan
14
accepted How to solve $ x = 5^{1345}\bmod 58$? Fermat's little theorem