irchans

11 ms·

1. 61.▲
   by irchans 5y ago

   I think I do my best thinking when jogging slowly.
2. 62.▲
   by irchans 5y ago

   I think that speech is also a pretty good superpower.
3. 63.▲
   by irchans 5y ago

   This is crazy. I never thought that anyone else would use those lectures to sleep. I like them when I'm awake also!
4. 64.▲
   by irchans 6y ago

   Wow. I kind of like that idea. I'm not sure it's true, but I like the idea.
5. 65.▲
   by irchans 6y ago

   We all thought that my dad was going to die from covid19. The doctors were very pessimistic. He lived. He recovered very slowly over the last 4 months. During the first month, he could not speak English (he was born in Norway), he neede
6. 66.▲
   by irchans 6y ago

   Hamilton the 2020 movie?
7. 67.▲
   by irchans 6y ago

   Would you mind expounding a bit on what "focused realization" and "imagination" mean in this context?
8. 68.▲
   by irchans 6y ago

   Maybe there are a few secrets to learning stuff. Has anybody taken the "Learning how to Learn" coursera course? https://www.coursera.org/learn/learning-how-to-learn?ranMID=...
9. 69.▲
   by irchans 6y ago

   It was my impression the Boeing had tried and failed to create a safe crew capsule. I am not sure if SpaceX succeeded.
10. 70.▲
    by irchans 6y ago

    I imagine that a large percentage (maybe 10%, maybe more) of the children in Sweden have been infected because they have more daily contacts and they "work" in crowded rooms. I am thinking that the kids could achieve herd immunit
11. 71.▲
    by irchans 6y ago

    I'm 55 and I have mostly worked for three companies in my life: Penn State (10 years, started there 1990), Raytheon (3 years, started 1995), and a small hedge fund (started 1996, 12 years). I haven't worked for Penn State for ab
12. 72.▲
    by irchans 6y ago

    Maybe "A first course in Abstract Algebra" by Fraleigh available on Kindle for less than $10. https://www.amazon.com/dp/0201763907 (It's not focused on Monoids. It also covers groups, rings, and field
13. 73.▲
    by irchans 6y ago

    I used to love Forth. I haven't written Forth code since the 80's. Maybe it's time to try it again.
14. 74.▲
    by irchans 6y ago

    Haskell. I lost my enjoyment for programming. I wrote very little code for about 5 years after burning out. One of my friends wanted to do a joint coding project and he suggested Haskell, so I solved one or two hundred project Euler probl
15. 75.▲
    by irchans 7y ago

    The number of new case per day in Italy has stabilized at 5000 to 6000 per day. Date Cases New Cases March 10 9172 1797 March 11 10149 977 March 12 12462 2313 March 13 15113 2651 March 14 17660 2547 M
16. 76.▲
    by irchans 7y ago

    Somewhat
17. 77.▲
    by irchans 7y ago

    I loved that essay :)
18. 78.▲
    by irchans 7y ago

    I seem to recall building small AM transmitters in elementary school. I don't remember if I used a transistor or not. I think it was easy to construct the capacitor and the inductor. (I build it in the early 70's and don't
19. 79.▲
    by irchans 7y ago

    Post-it Notes
20. 80.▲
    by irchans 7y ago

    I called my high school math teachers to thank them after I got a Ph.D. in Mathematics 13 years after I graduated high school.
21. 81.▲
    by irchans 7y ago

    You hit upon a very important point. Suppose that you have a 2 planet system: A sun type star (mass 2 10^30 kg), an Earth type planet 1 AU from the sun (weight 6 10^24 kg), and a Jupiter type planet (mass 2*10^27 kg) that is 1000 AU away f
22. 82.▲
    by irchans 7y ago

    I believe this is false in the sense that Mercury's orbit is more centered about the center of the Sun rather than the barycenter of the solar system (center of mass).
23. 83.▲
    by irchans 7y ago

    The article quotes Cathy Jordan,"Technically, what is going on is that the Earth, Sun and all the planets are orbiting around the center of mass of the solar system". I believe that the statement is a good approximation for the or
24. 84.▲
    by irchans 7y ago

    I computed Fibonacci(20*10^6) using Binet's formula. The answer has 4179753 digits. I computed sqrt(5) to 4179753 digits and applied the formula. The result was correct. The time to compute sqrt(5) was 0.23 sec. The time compute th
25. 85.▲
    by irchans 7y ago

    I don't think it's too hard to get the sqrt(5) to a high enough degree of precision. (Probably could use Newton-Raphson.) On my computer it takes about 0.05 seconds to compute sqrt(5) to one million digits. It takes about 0.01
26. 86.▲
    by irchans 7y ago

    Nice. Thanks for that.
27. 87.▲
    by irchans 7y ago

    I am wondering if all three methods (sqrt(5) method, 2x2 matrix exponentiation, and jacobolus's power of two method) take approximately the same amount of time --- slightly less than O( log(F_n)*log(F_n)^2) (using Fürer's algorit
28. 88.▲
    by irchans 7y ago

    Interestingly, I learned to program in a completely different way. When I started in 1979, the computer terminal where I learned could only run BASIC. There were no directories, just BASIC. We had one book that could teach you most of th
29. 89.▲
    by irchans 8y ago

    I like Techdragon's idea "I’d write it in math" and Onion2k's "I'd build a mechanical system." A lot of it depends on the complexity of the software and the complexity of the interface to the user(s). If
30. 90.▲
    by irchans 8y ago

    Edward Jenner & Louis Pasteur (vaccines)