14,903 reputation
12975
bio website linkedin.com/in/crntaylor
location London, United Kingdom
age 30
visits member for 3 years, 4 months
seen 2 days ago

I'm broadly interested in very applied math. I try to apply ideas from mathematics, statistics, machine learning, formal systems and computer science to solve real-world problems. Mostly in applied finance/quantitative trading, but in other areas if the mood takes me.


The following is for my own use, but feel free to borrow it -

Hi. It looks like you are new here. We are generally very willing to help, but we like users to show the work that they've done towards solving the problem on their own first. If you can edit your question to show the code you've written so far, and where you are stuck, then you will get a much better response.


Nov
28
accepted Why is the unit of a compact closed category coordinate-independent?
Nov
27
comment Why is the unit of a compact closed category coordinate-independent?
Yes, you're right. I was fixated on the idea that the coordinates of a matrix depend on the choice of basis, forgetting that that's not true for the identity!
Nov
27
answered A mathematical puzzle.
Nov
27
asked Why is the unit of a compact closed category coordinate-independent?
Nov
27
revised Hopf bifurcation - System Transformation
added 12 characters in body
Nov
27
answered Hopf bifurcation - System Transformation
Nov
27
comment Do the vectors not in the column space form a subspace? [GStrang P130 3.1.27]
You can write $u = u_W + u_{W^C}$ where $u_W\in W$ and $u_{W^C}\notin W$. Then $u+w=(w+u_W)+u_{W^C}$ where $w+u_W\in W$ and $u_{W^C}\notin W$. So $u+w\notin W$ unless $u_{W^C}=0$, but that would mean $u=u_W\in W$, contradicting $u\notin W$.
Nov
26
revised Do the vectors not in the column space form a subspace? [GStrang P130 3.1.27]
added 967 characters in body
Nov
26
comment Do the vectors not in the column space form a subspace? [GStrang P130 3.1.27]
@LePressentiment You're right that $w\in W$ is not in $U$. But $u+w$ is in $U$ (it has to be, because $u\notin W$, hence (1) $u+w\notin W$ and (2) $u+w\neq 0$).
Nov
26
revised Another question of finding eigenvalues with parameters
added 36 characters in body
Nov
26
comment Do the vectors not in the column space form a subspace? [GStrang P130 3.1.27]
@LePressentiment I edited the answer for you.
Nov
26
revised Do the vectors not in the column space form a subspace? [GStrang P130 3.1.27]
added 332 characters in body
Nov
25
comment Do the vectors not in the column space form a subspace? [GStrang P130 3.1.27]
@dezign That is true, but irrelevant to this question.
Nov
25
answered Do the vectors not in the column space form a subspace? [GStrang P130 3.1.27]
Nov
15
comment What is the formula for calculating Profit Percentage?
You make infinite return.
Oct
17
comment Optimization question
I am assuming that the centre of the cylinder is at $(0,0)$ so that one edge of your plank is at $-x$ and the other is at $+x$, for a width of $2x$. Yes, to find $h(x)$ you can use Pythagoras' theorem.
Oct
17
answered Optimization question
Oct
10
comment Count of 3-digit numbers with at least one digit as 9
I think that this should be re-opened. It clearly isn't a homework question (the OP has posted his own answer).
Sep
20
revised Examine phase portrait $(f,f')$ for $f"+vf'+\alpha^2f(1-f)=0$ and determine asymptotic behavious of solutions as $x\to \pm \infty$
edited title
Sep
13
comment What is the most accurate way to project a total running time based on a 95% complete run?
That's a fair point!