Recent content by Office_Shredder

  1. O

    I Integers in base Pi

    So wait, what's even the point of ##\pi## here? You've just come up with a complicated way of writing down the integers. Here's a fact. If you construct an injection f from Z to R, then define a + which I'll call +' by f(x)+'f(y) = f(x+y), then f(Z) with +' will have a group structure, but it...
  2. O

    I Integers in base Pi

    But you said 1 is in the group. If 1 is in the group, and it's closed under addition, then 11 must be in the group. Unless you are defining addition weirdly. What is 1+1+1+...+1 supposed to be equal to?
  3. O

    I Integers in base Pi

    It's not a group then. If 1 is in the group, 1+1+1+1+1+1+1+1+1+1+1 must be in it also.
  4. O

    Solving a modulus inequality in ##x##

    I think what you wrote is right, but if a is negative you get the situation in the original post where you construct overlapping intervals.
  5. O

    I Integers in base Pi

    How do you express ##11\pi## in this setup? Edit to add: also, how do you express 11?
  6. O

    Stuck at proving a bounded above Subsequence

    The point of what I wrote is that I assumed we already had the first k elements of the sequence which you dropped from your final list, but your sequence also works. I would consider what you wrote a proof. It's possible if you're taking a class they will require you to write something more...
  7. O

    Boeing Boeing 737 Max MCAS System

    That's probably a bit unfair. Only two planes have crashed from implementing a solution to this. Do you think this hasn't prevented two planes crashes in the history of the regulation?
  8. O

    Stuck at proving a bounded above Subsequence

    You spend a lot of , big words justifying the existence of ##n_{k'}## that both doesn't seem necessary to me and sounds very confusing. I would just say something like, given ##n_1,...,n_k## in the subsequence, we know there is some ##n>n_k## such that ##a_n<L##. Let ##n_{k+1}=n##. And do...
  9. O

    B Looking for a good example of a naturally occuring compounding process

    Hmmm. Population growth of humans isn't really purely exponential but not a terrible example if it makes sense. Moore's law of computing power might be intuitive - 20 years ago computers couldn't even run the first ten frames of a modern video game etc.
  10. O

    The Mandalorian: Season 2

    The camera they use in clone wars adds 20mph to all movement, so that's not surprising.
  11. O

    COVID-19 Coronavirus Containment Efforts

    What about the second peak in July that was bigger than the April one? And why are the cases per day supposed to be so b temporally correlated with lack of scent complaints, but the actual average review doesn't go up and down? Manufacturing problems can result in your primary supply chain...
  12. O

    COVID-19 Coronavirus Containment Efforts

    The graph of reviews mentioning lack of smell by month seems pretty unconvincing to me. I would guess the real problem is either a new customer base trying the candles, or a decrease in manufacturing quality because of supply chain issues. The graph also suggests that maybe 3% additional...
  13. O

    Physics Looking for a postdoc in a different field than my PhD, among other things

    What is your career goal? In math, the point of a post doc is to spend three years building a cv to try to apply for a tenure track position. The point is not to do a second PhD. Maybe physics is different, but it feels like you're not focusing on the right stuff here. Even if your goal...
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    B Modus tollens problem

    If you think that when you have ten dollars you also have one dollar, then why does the statement that you have one dollar mean you cannot have ten dollars? Either you mean you have exactly 1 dollar, or you mean you have at least 1 dollar. You seem to be confusing the two statements in various...
  15. O

    Find a function satisfying these conditions: f(x)f(f(x)) = 1 and f(2020) = 2019

    Right, so 2018 is in the range, which means f(2018) = 1/2018 as you figured out. Now what are the possible graphs of this function? Well we know between 1/2019 and 2019 it's just 1/x. One possible choice is that for x < 1/2019 Ave x > 2019, it wiggles around however you want so that f(x) is...