4 ms·

It seems that yes, they're saying that 1 and 5 are roughly the same. Basically, why is the matter in the universe ~20% "non-dark", and not 1%, or .001%?

timeagain 3y ago
There’s that old joke that computer scientists think any numbers within a power of two are equal, physicists think any numbers within a power of 10 are equal, and mathematicians only distinguish between finite numbers and infinity. Edit: and engineers are as precise as they are paid to be.
- edu 3y ago
  And cows are spherical!
  - pvaldes 3y ago
    At some point of its lives. Yes. Is an universal true. Then the zygote starts splitting.
- munificent 3y ago
  For software engineers, the only numbers are 0, 1, and infinity. https://en.wikipedia.org/wiki/Zero_one_infinity_rule https://en.wikipedia.org/wiki/Zero_one_infinity_rule
- groby_b 3y ago
  between finite numbers and infinities. Plural, please, the discerning mathematician keeps a stable of infinities ;)
- Gibbon1 3y ago
  Having proved the contribution of these second and third order terms are between plus 10 and 20% over the range of interest we will multiply by a constant 1.15
xjay 3y ago
"The 80/20 rule"/The Pareto principle > Mathematically, the 80/20 rule is roughly described by a power law distribution (also known as a Pareto distribution) for a particular set of parameters. Many natural phenomena distribute according to power law statistics. It is an adage of business management that "80% of sales come from 20% of clients." [1][2] [1] https://en.wikipedia.org/wiki/Pareto_principle https://en.wikipedia.org/wiki/Pareto_principle [2] https://en.wikipedia.org/wiki/Power_law https://en.wikipedia.org/wiki/Power_law
- hatthew 3y ago
  Could you elaborate on how this is related? To me, the 80/20 rule and the 1:5 matter ratio seem like entirely separate concepts that coincidentally share the same ratio.
  - robertlagrant 3y ago
    1:4, no?
    - hatthew 3y ago
      Good point, I wasn't thinking and I equated ratios and fractions. That should make the 80/20 rule even less related to the 1:5 matter ratio?
      - delecti 3y ago
        Well 80:20 and 5:1 are pretty similar ratios. Though really the issue with the comparison is that it implies that 80% (or ~83.3%) of the <something> is correlated to the light matter, and the other 20% (or ~16.7%) of the <something> is correlated to the dark matter. Maybe eventually we'll learn enough about dark matter and discover that, yeah actually, 1/6 of the life, or unobtanium, or whatever, is actually in the dark matter. But for now, I agree that the Pareto principle seems pretty irrelevant.

timeagain 3y ago

There’s that old joke that computer scientists think any numbers within a power of two are equal, physicists think any numbers within a power of 10 are equal, and mathematicians only distinguish between finite numbers and infinity. Edit: and engineers are as precise as they are paid to be.

edu 3y ago
And cows are spherical!
- pvaldes 3y ago
  At some point of its lives. Yes. Is an universal true. Then the zygote starts splitting.
munificent 3y ago
For software engineers, the only numbers are 0, 1, and infinity. https://en.wikipedia.org/wiki/Zero_one_infinity_rule https://en.wikipedia.org/wiki/Zero_one_infinity_rule
groby_b 3y ago
between finite numbers and infinities. Plural, please, the discerning mathematician keeps a stable of infinities ;)
Gibbon1 3y ago
Having proved the contribution of these second and third order terms are between plus 10 and 20% over the range of interest we will multiply by a constant 1.15

xjay 3y ago

"The 80/20 rule"/The Pareto principle > Mathematically, the 80/20 rule is roughly described by a power law distribution (also known as a Pareto distribution) for a particular set of parameters. Many natural phenomena distribute according to power law statistics. It is an adage of business management that "80% of sales come from 20% of clients." [1][2] [1] https://en.wikipedia.org/wiki/Pareto_principle https://en.wikipedia.org/wiki/Pareto_principle [2] https://en.wikipedia.org/wiki/Power_law https://en.wikipedia.org/wiki/Power_law

hatthew 3y ago
Could you elaborate on how this is related? To me, the 80/20 rule and the 1:5 matter ratio seem like entirely separate concepts that coincidentally share the same ratio.
- robertlagrant 3y ago
  1:4, no?
  - hatthew 3y ago
    Good point, I wasn't thinking and I equated ratios and fractions. That should make the 80/20 rule even less related to the 1:5 matter ratio?
    - delecti 3y ago
      Well 80:20 and 5:1 are pretty similar ratios. Though really the issue with the comparison is that it implies that 80% (or ~83.3%) of the <something> is correlated to the light matter, and the other 20% (or ~16.7%) of the <something> is correlated to the dark matter. Maybe eventually we'll learn enough about dark matter and discover that, yeah actually, 1/6 of the life, or unobtanium, or whatever, is actually in the dark matter. But for now, I agree that the Pareto principle seems pretty irrelevant.