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 Yearling
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Apr
8
comment Quick question on Pauli matrices and u(2)
The four complex coefficients of the Pauli matrices provide in total 8 real degrees of freedom, which matches the number of degrees of freedom in the complex $2x2$ matrix.
Mar
20
comment Why does this sequence converge to φ?
$\phi$ is a fixed-point of your recurrence relation, $\phi=\sqrt{1+\phi}$.
Feb
3
answered Zauner's conjecture
Feb
3
awarded  Yearling
Feb
3
answered Asymptotic behavior of a function
Jan
27
comment What kind of geometric object is the Pauli spin matrix vector $\vec{\sigma}$?
crossposted at mathoverflow.net/questions/229328/…
Jan
23
comment Integral involving the gamma function
crosslisted at mathoverflow.net/questions/229065/…
Nov
9
comment Logarithmic expansion with cosines
I added more intermediate steps, is it clear now?
Nov
9
revised Logarithmic expansion with cosines
added 159 characters in body
Nov
8
comment Logarithmic expansion with cosines
yep, I couldn't resist :)
Nov
8
answered Logarithmic expansion with cosines
Jul
23
comment Help with textbook formula
en.wikipedia.org/wiki/Multivariate_normal_distribution
May
18
answered Clarification on some definitions in Operator Theory
Jan
22
comment Definition of mth order stationarity
this question is answered here: stats.stackexchange.com/questions/78120/…
Sep
24
awarded  Autobiographer
Jul
13
comment Integer Solutions To Linear Equation
khanacademy.org/math/arithmetic/fractions/Equivalent_fractions/…
Jun
30
comment Represent an integer as a sum of n non-consecutive squares
hmm, does that answer the OP's question for any $n$?
Jun
8
comment Heat transfer: boundary conditions with fluid velocity
@mkl314 --- perhaps this discussion (on whether the $v\cdot n$ in the boundary condition should be multiplied by $u$ or by $u-u_b$) can be settled by just considering what would happen if you would open a window in your room; there's a draft ($v\cdot n\neq 0$), but the temperature inside and outside is the same ($u=u_b$). Surely one would not expect a temperature gradient to appear?
Apr
23
awarded  Teacher
Apr
22
answered How to get transition matrix of markov process?