heinrichhartman

45 ms·

421.
by heinrichhartman 10y ago
- Every real number can be represented as a limit of rational numbers, which are uncountable. - So for every countable subset you can find a (Cauchy) sequence of rationals that does not converge. Hence, you loose one of the most important t
422.
by heinrichhartman 10y ago
Are you aware of the concept of periods ? This is a quite fascinating, countable, ring of numbers, that captures all of the above: Kontsevich and Zagier introduce and develop this concept quite far: http://www.maths.ed.ac.uk&#x2F
423.
by heinrichhartman 10y ago
Good luck developing analysis with only countable infinities. Limits will take you out of the realm of countable spaces. Most of your derivatives and integrals won't exists, if you force them to take values in countable sets.
424.
by heinrichhartman 10y ago
Thanks for your list. In the IT Operations / Monitoring domain time series models play a large role. At the same time the level of sophistication is rather low. You definetly have to start with the basics when teaching such a course.
425.
by heinrichhartman 10y ago
I wrote an article for the ACM Queue (also published in CACM) about this very issue called "Statistics for Engineers" http://queue.acm.org/detail.cfm?id=2903468
426.
by heinrichhartman 10y ago
> we tried to show her a visual representation of the multiplication I find that visual methods, open up many ways to deeper understanding of arithmetic. Even advanced topics like binomial coefficients pop up quite naturally when folling
427.
A Ditigal Passport for Digital Citizens(heinrichhartmann.com)
2 points by heinrichhartman 10y ago|0 comments
428.
Outlier Detection at TouchTunes (powered by Circonus Analytics)(circonus.com)
6 points by heinrichhartman 10y ago|0 comments
429.
by heinrichhartman 10y ago
The same argument could be made against the US federal government. Two points: (A) unified legislation is tremendoulsy important for trade/business (B) larger associations have far more influence than small ones.
430.
by heinrichhartman 10y ago
That's not likely going to happen nore is it a sensible thing to ask for. As an ISP how would you _guarantee_ the bandwidth for each endpoint? You would have to provision for the maximal capacity all over your network. Given that most
431.
by heinrichhartman 10y ago
Wow, tex2page looks really great. I'll might setup a JEKYLL workflow for using it to write blog posts. LaTeX doc semantics are so much better than Markdown / HTML. Also I can see a LISP style macro processor being super awesome. L
432.
by heinrichhartman 10y ago
From http://www.tldp.org/HOWTO/Assembly-HOWTO/external.html : About m4 macro-processor: "However, its disfunctional quoting and unquoting semantics force you to use explicit continuation-passing tail-recursive
433.
by heinrichhartman 10y ago
Lot's of good bits around 45:00: "We don't compete against Oracle, we compete against fopen(3)"
434.
by heinrichhartman 10y ago
He gives the answer himself a few minutes later (46:00): "You need that server process to coordinate write concurrency."
435.
by heinrichhartman 10y ago
I am curious about the third one. Why do all other DB products use a clinet-server model, or at least have a dedicated thread for the DB? I suppose, you can handle writes asynchronously to gain some performance. Are there other upsides?
436.
by heinrichhartman 11y ago
So, which APIs should be used nowadays?
437.
by heinrichhartman 11y ago
Indeed! Thanks a lot. Its corrected now. ... no wait: It's corrected now. ;)
438.
by heinrichhartman 11y ago
I think so, but the memory usage is drastically lower: Only O(x/ln(x)) vs. O(x), for getting all primes up to x.
439.
by heinrichhartman 11y ago
Author here: Yes, that true, thanks for pointing it out. [In fact, Erathosthenes is mentioned later in that note.] I still find it remarkable, that you can avoid divisions, while not to computing all multiples up-front and marking the resu
440.
by heinrichhartman 11y ago
Yes, it's entirely possible! I once crunched some 350GB of arxiv.org papers on an old ThinkPad: https://github.com/HeinrichHartmann/related-work.net/tree/ma... Demo here: http://dev.related-wo
441.
by heinrichhartman 11y ago
Does ist support scan to ftp? I find the Linux/sane scanner drivers unbarable. I use a network scanner that uploads the pdfs to an ftp server, that syncs to dropbox. Works like a charm. Just need a tool to annotate an tag those pdfs.
442.
by heinrichhartman 11y ago
More like: "I am aware of several proofs of this theorem. None of them is trivial."
443.
by heinrichhartman 11y ago
Be aware, that load averages are exponentially damped averages not moving averages over windows of length 1,5,10 mintues. More quirks with linux performance tools are outlined in Brendan Gregg's talk: http://www.slideshare.n
444.
by heinrichhartman 11y ago
Cached version https://webcache.googleusercontent.com/search?q=cache:BZ3Zeq...
445.
by heinrichhartman 11y ago
+1! Are you aware of reasonable high dimensional "visualizations". It cant' be accurate of course. But catpuring essential features would be nice. E.g. here is a 4d cube: https://commons.wikimedia.org/wiki&#x2