keithalewis

6 ms·

1.
by keithalewis 9mo ago
https://math.uchicago.edu/~shmuel/Network-course-readings/MC...
2.
by keithalewis 1y ago
I see what you did there.
3.
by keithalewis 2y ago
There is no need for it. Here is a simple replacement: https://keithalewis.github.io/math/um1.html .
4.
by keithalewis 2y ago
Linus wrote it, so there's got to be a pony in there somewhere. He's the first person in the world to figure out version control software. /s
5.
by keithalewis 2y ago
Thank you for your diligence in explaining complicated topics in a way that makes them accessible to people trying to learn what people before them figured out. You are a true educator that seems have found a place to support you to continu
6.
by keithalewis 2y ago
The Wikipedia page on this is sufficient. If F:X -> Y is a function between normed linear spaces then DF:X -> L(X,Y), where L(X,Y) is the vector space of linear operators from X to Y, satisfies F(x + h) = F(x) + DF(x)h + o(h). A funct
7.
by keithalewis 2y ago
"This book aims to standardize the notation for tensor diagrams..." https://youtu.be/zELbzXAmcUA?t=73
8.
by keithalewis 2y ago
The author also seems to be unaware of Fréchet derivatives.
9.
by keithalewis 2y ago
This is incomplete, incorrect, and irrelevant. Standard notation already exists. I'm sure it is fun to draw squiggly lines and some people enjoy reinventing the wheel. Spend some time learning what others have taught us before striking
10.
by keithalewis 2y ago
Your statement "the best path forward for me understanding is a path that can maintain that curiosity" comes off as entitled. Only you owe yourself that. "I can play with Arnold's cat and, slowly, through no scientific r
11.
by keithalewis 2y ago
Let S = {1, 2}. Every distance function is determined by d(1,2) = a, a >= 0. Define f(d) = {{1,2}} if a = 0 and f(d) = {{1},{2}} otherwise. Isn't this a clustering algorithm that is scale invariant, rich, and consistent?
12.
by keithalewis 2y ago
You made a completely obvious and true statement starting with "It would help..." That seems to be frowned upon on HN. BTW, a simpler definition of a (small) category is that it is a partial monoid.
13.
by keithalewis 2y ago
We agree. The case was about Renaissance breaking the law. The best lawyers their money could buy lost and did not avail themselves of their right to appeal. The ruling body found they were tax cheats. Philanthropic work is great way to get
14.
by keithalewis 2y ago
Worked for Renaissance Technologies: https://www.ft.com/content/8cef8c70-5d02-4762-9100-2d92d0c76...
15.
by keithalewis 2y ago
Category theory is just another way of looking at math besides the impoverished notion "everything is a set". Mathematics is used in computer science. Rust is a great example. Jean-Yves Girard invented linear logic to make Gerhard
16.
by keithalewis 2y ago
This. Motivation is the key to getting employees to produce over a period of time. Give the good ones the maximum amount of ownership they can handle and they will set an example for everyone else. Grow the talent over time. Fire the whinny
17.
by keithalewis 2y ago
And, like, a LARPing mode I could use while sitting in my mom's basement that would automagically post every brain fart I had to HN. That would be totally cool!
18.
by keithalewis 2y ago
When I worked at Bloomberg their first coding guideline was "Don't sweat the small stuff." I was mystified by that when I first read it. Then I sat in meetings where someone would drone on about how clever they thought their
19.
by keithalewis 2y ago
Front page material? P(max{X_1, X_2} <= x) = P(X_1 <= x, X_2 <= x) = P(X_1 <= x) P(X_2 <= x) = xx. P(sqrt(X_3) <= x) = P(X_3 <= x^2) = x^2. It is late in the day when midgets cast long shadows.
20.
by keithalewis 2y ago
You are missing what is missing. Their source code does not fill in the missing pieces.
21.
by keithalewis 2y ago
Never underestimate the power of das blinkenlights to entertain lazy dumb people.
22.
by keithalewis 2y ago
I work hard to be lazy.
23.
by keithalewis 2y ago
There are Pythagorean triples (a, b, c) for which there do not exist integers m, n with a = m^2 - n^2, b = 2mn, c = m^2 + n^2.
24.
by keithalewis 2y ago
Just pointing out what the theoretical documentation says. A stream should have operations for empty, current, and next. You don't want implementation details leaking into the abstract model.
25.
by keithalewis 2y ago
This seems to make the mistake of identifying a vector with a stream.
26.
by keithalewis 2y ago
HN spamtroturfing one of their own startups? I'm shocked, shocked!
27.
by keithalewis 2y ago
What is a delta function at a composed with a delta function at b <> a?
28.
by keithalewis 2y ago
Do you realize it toggles data and formula display? That ought to be fine for anyone with more short term memory than a gnat.
29.
by keithalewis 2y ago
I wrote something to make it simple to embed C++ in Excel. It is useful for pushing business logic into platform independent code that can be integrated into back end production systems. One bonus is the original spreadsheet has unit tests
30.
by keithalewis 2y ago
Control-backtick toggles formulas. No need for VB(A).

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