26,986 reputation
32071
bio website
location
age
visits member for 3 years, 4 months
seen 1 hour ago

5h
comment How to find center of a circle from only an arbitary arc of that circle
A question with 22 upvotes and 8 answers "has not received enough attention" ?
Jan
23
comment Can the natural proof of this algebraic identity be simplified?
exactly what I was looking for, thanks
Jan
23
accepted Can the natural proof of this algebraic identity be simplified?
Jan
23
revised Can the natural proof of this algebraic identity be simplified?
edited tags
Jan
22
comment Can the natural proof of this algebraic identity be simplified?
@user26857 all the computations take place in the polynomial ring in indeterminates $a_1,a_2,b_1,b_2,c_0,c_1,c_2,c_3$. The identity is equivalent to membership of LHS-RHS in a certain ideal. By the way, would you also find it strange to apply the "commutative-algebra" tag to the current answer by Jake Levinson ?
Jan
22
revised Can the natural proof of this algebraic identity be simplified?
edited tags
Jan
22
revised Can the natural proof of this algebraic identity be simplified?
edited body
Jan
22
asked Can the natural proof of this algebraic identity be simplified?
Jan
22
comment Determining the Number of Zeros of a (Holomorphic) Polynomial $f:\mathbb{C}\to\mathbb{C} $ in each Quadrant.
"Holormorphic polynomial" is redundant, like "British Englishman". I suppose you mean you want a solution that uses complex analysis
Jan
22
comment Prove that $1\cdot f(1)+ 2\cdot f(2)+ …+ n\cdot f(n) \leq n(n+1)(2n+1)/6$ where $f(n+1) = f(f(n))+1$
This is a complete proof, but people seem not to have noticed
Jan
19
awarded  Necromancer
Jan
18
asked algorithm related to dyadic decomposition
Jan
15
comment When is $(x-1)(y-1)(z-1)$ a factor of $xyz-1$?
Indeed, a much simpler solution than mine is presented in the link you gave.+1
Jan
13
awarded  Revival
Jan
13
revised Find the determinant of the following matrix
added 58 characters in body
Jan
13
comment Find the determinant of the following matrix
@Paul555 see my update
Jan
12
answered Find the determinant of the following matrix
Jan
11
answered baire category and the union of dyadic balls of rational center
Jan
11
awarded  Revival
Jan
11
answered What would change in mathematics if we knew $\pi+e$ is rational?