DavidSJ

74 ms·

691.
Leading mathematician launches arXiv 'overlay' journal(nature.com)
93 points by DavidSJ 11y ago|20 comments
692.
by DavidSJ 11y ago
Thanks, I sent them $50.
693.
by DavidSJ 11y ago
Thanks for writing that letter.
694.
by DavidSJ 11y ago
Perhaps you're thinking of Byzantine Paxos (not regular Paxos)? I'll have to read up on that to determine its relevance to the double-spend problem. One concern I'd have is how parliament membership is determined (e.g. what a
695.
by DavidSJ 11y ago
Paper here: http://dump.mntmn.com/interim-paper/ This seems motivated similarly to the OS Alan Kay's Viewpoints Research Institute is working on -- an OS a single person can comprehend.
696.
by DavidSJ 11y ago
I think it would be more accurate to say that what Bitcoin provides that Paxos and Raft do not is trust-free consensus. The members of the Paxos parliament all trust that the others are properly following the protocol, but they still have
697.
by DavidSJ 11y ago
Also, small satellites have much higher surface area to mass ratios.
698.
by DavidSJ 11y ago
It also fails to handle sites having different (and non-intersecting) password "security" requirements.
699.
Texas high school math text claims no bijection between integers and rationals(reddit.com)
4 points by DavidSJ 11y ago|2 comments
700.
by DavidSJ 11y ago
It'll be closer to about $200 maybe. And it's an awful waste of energy (not saying mining bitcoin in general is a waste of energy, but doing it this way is).
701.
by DavidSJ 11y ago
Grid search never exhausts the search space either, at least if the dimensions are continuous.
702.
by DavidSJ 11y ago
Actually, random search works a lot better than grid search for hyperparameter optimization. Usually, only a small number of hyperparameters actually matter, the trick is figuring out which ones. Grid search wastes time on irrelevant dimens
703.
by DavidSJ 11y ago
Recent discussion on /r/math: https://www.reddit.com/r/math/comments/3dbcfm/chicago_underg...
704.
by DavidSJ 11y ago
> the space-x guys are ... very proud that they did a test flight with a separation near max-q specifically to prove it would work just fine even at max-q… The in-flight abort test for Dragon v2 is scheduled to occur later this year. It
705.
by DavidSJ 11y ago
There are no solid rocket boosters on Falcon 9.
706.
by DavidSJ 11y ago
It always amazes me how people see this video and immediately think "I need to redesign this for them" rather than "wow, that prototype is amazingly close to working beautifully". It's as if a complex software syste
707.
by DavidSJ 11y ago
Also known as middle endian.
708.
by DavidSJ 11y ago
They're obviously crazy to us. Our illusions might look obviously crazy to them. And generally humans don't natively know when they're experiencing an optical illusion. They have to be taught it. And in either case, it&#x27
709.
On proof and progress in mathematics (1994)(arxiv.org)
1 points by DavidSJ 11y ago|1 comments
710.
by DavidSJ 11y ago
How many organizations have warrant canaries by now? Of those, how many have let the canary expire, indicating a warrant was issued? If the answer is zero, which is more plausible: 1) that no such warrants have ever been issued, or 2) that
711.
by DavidSJ 11y ago
The neocortex is over half of the human brain by mass or volume, and it plausibly uses a small number of distinct algorithms (believed by some to correspond very loosely to those of artificial neural networks) to learn and remember a vast d
712.
Counting rods(en.wikipedia.org)
22 points by DavidSJ 11y ago|0 comments
713.
by DavidSJ 11y ago
Agreed, they're probably too old for this. Maybe six year olds would still have the fluid intelligence for this sort of abstract mathematics.
714.
by DavidSJ 11y ago
Handicap eyeshades for daydreamers. I think Harrison Bergeron is about that.
715.
by DavidSJ 12y ago
Yes, but even one quarter the way around the world turns out to be very close to orbital energy, because your delta-distance per delta-v increases rapidly as you increase energy. Nearly all ICBMs are multi-stage rockets for this reason. Veh
716.
by DavidSJ 12y ago
The shape of the curve isn't different just because the ground's in its way. This post has an illustration that makes the concept clear: http://forum.kerbalspaceprogram.com/threads/108970-Help-with... (Note:
717.
by DavidSJ 12y ago
> It is perfectly possible to miss orbit even after a complete circumnavigation. Yes, if you have a source of lift, and you're within the atmosphere, then you can circumnavigate the globe without reaching orbital velocities. A balli
718.
by DavidSJ 12y ago
A suborbital trajectory is an ellipse that intersects the ground, and it will do so twice within less than half the world's circumference. If you can make it halfway around the world, you're orbital. New York to Tokyo is nearly ha
719.
by DavidSJ 12y ago
That seems to explain why evolution hasn't done much to stop aging, but it doesn't describe the mechanisms of aging itself, which cause mortality rates to increase over time with this particular curve.
720.
by DavidSJ 12y ago
If Google actually had the algorithm for a cat, I'd like to see them release that too.

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