irchans

11 ms·

1. 91.▲
   by irchans 8y ago

   Mr Musk's company SpaceX has brought down the cost to orbit by a factor of three. That's a big deal. Not as big as Edward Jenner & Louis Pasteur (vaccines) or Isaac Newton, but still pretty big.
2. 92.▲
   by irchans 8y ago

   George Washington
3. 93.▲
   by irchans 8y ago

   Sir Isaac Newton
4. 94.▲
   by irchans 8y ago

   Mikkel Vestergaard Frandsen - His company saved the lives of about 10 million people (my wild ass guess) with approximately one million water purifiers and something like 1 billion mosquito nets distributed in Africa. (See https:/&#x
5. 95.▲
   by irchans 8y ago

   Usually I do not decide what problems to solve. They just come to me and I try to solve them. I have tried to solve some big problems, but that has never worked out for me. The "problems" that I solve, or try to solve, come most
6. 96.▲
   by irchans 8y ago

   I have used a particular method that I first learned from Tony Robbins for making decisions. I've been using it for 10 years, but I recently saw an article about it in the NYT. "How to Make a Big Decision" - The New York Tim
7. 97.▲
   by irchans 8y ago

   I used Haskell at work for the first time about 3 months ago. I reimplemented a chunk of our trading software. It ended up being about 1000 lines of Haskell. Fun :)
8. 98.▲
   by irchans 8y ago

   I have degrees in Math (PhD), CS(MS), and Engineering(BS). I find wonderful interactions between all three. My career is a bit mixed up: Taught Math at a college (part time on and off for 10 years), Meteorologist (only 2 years), Nuclear E
9. 99.▲
   by irchans 8y ago

   That seems really cool!
10. 100.▲
    by irchans 8y ago

    I have coauthored about 20 articles over the last 25 years, mostly in peer reviewed mathematics journals. I published the first three while in grad school. After grad school, my advisor and I just kept collaborating meeting once a week for
11. 101.▲
    by irchans 8y ago

    Wow, at age 53 I am definitely slower. I type more slowly and I remember less. On the other hand, maybe I know a bit more than I did when I was young.
12. 102.▲
    by irchans 8y ago

    I am 53 and I started to learn BASIC at the age of 15. I started writing assembly code about 2 years later to speed up the games I wrote in BASIC. I write a small amount of code almost every day (maybe 30 or so lines of Mathematica code),
13. 103.▲
    by irchans 9y ago

    Subspaces, Point-Set Topology, Compactness, Matrix Spaces, Limits, Linear Dual Spaces, Hilbert Spaces, Banach Spaces, Subgradients, Gâteaux derivative, Connected Sets, Path Connected Sets, Cauchy Sequences, Power Series, Taylor's Theor
14. 104.▲
    by irchans 9y ago

    Basic probability is very helpful: Expectation, Standard deviation, P(A and B) = P(A)*P(B) is A and B are independent, P(A or B) = P(A)+P(B) if A and B are mutually exclusive. Also, knowing algebra is very helpful. In a way, you don'