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Mathematics
james black's user avatar
james black's user avatar
james black's user avatar
james black
  • Member for 6 years, 9 months
  • Last seen more than 3 years ago
  • NYC
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8
Show that a matrix is invertible with norm less than one
Apr 17, 2018
6
$\operatorname{rank}(AB-BA)=1$ implies $AB-BA$ is nilpotent
Dec 20, 2020
5
Newton's Method with Cubic Convergence (three taylor terms instead of two)
Jan 28, 2018
4
Value of $i^\sqrt3$
Jan 17, 2021
3
Sum of subspaces equal to span of union of subspaces
Oct 16, 2020
3
Zero vector in quotient space
Oct 16, 2020
3
Voting Counting Problem With Generating Functions
Mar 20, 2019
3
Connected Graph With Minimum Degree
May 4, 2019
3
Random Variables Proof $P(Y_1+Y_2+Y_3+...+Y_n=k)=\frac 1 {m^n} \sum (-1)^i \binom{n}{i} \binom{k-mi-1}{n-1}$ using binomial theorem
Feb 14, 2018
3
If $x+y=1$ then $x^{n+1}\sum\limits_{k=0}^n \binom{n+k}{k}y^k+y^{n+1}\sum\limits_{k=0}^n \binom{n+k}{k}x^k=1$
Feb 7, 2018