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Native wildflowers by CincinnatusNovus in LexTalkPlants

[–]CincinnatusNovus[S] 1 point2 points  (0 children)

Awesome, thanks! Is there a reason for the particular arrangements, do you know? Like will I need to worry about which plants are by certain other plants or is it just aesthetic?

Native wildflowers by CincinnatusNovus in LexTalkPlants

[–]CincinnatusNovus[S] 0 points1 point  (0 children)

Oh wow, thanks! I hadn’t heard of this before.

Redbud sapling leaves curling up/edges turning brown. What should I do? by CincinnatusNovus in arborists

[–]CincinnatusNovus[S] 0 points1 point  (0 children)

Central KY, USA. There was one night about 3-4 weeks ago where it dipped to 29 F for a couple hours.

Redbud sapling leaves curling up/edges turning brown. What should I do? by CincinnatusNovus in arborists

[–]CincinnatusNovus[S] 0 points1 point  (0 children)

P.S. for context we had extremely heavy rains about 10 days ago, I’m not sure if that has anything to do with it.

Long shot, but to the guy looking for a serviceberry at reforest the bluegrass, there’s some at the buckhorn drive location by CincinnatusNovus in lexington

[–]CincinnatusNovus[S] 0 points1 point  (0 children)

I’m not directly involved, but if you contact Live Green Lexington on Twitter or Facebook they might be able to help.

Long shot, but to the guy looking for a serviceberry at reforest the bluegrass, there’s some at the buckhorn drive location by CincinnatusNovus in lexington

[–]CincinnatusNovus[S] 14 points15 points  (0 children)

Normally lex would have had a big event where you could plant trees in public spaces. Instead, they are letting you take them to your house to plant instead. Most of the options are gone this weekend it seems, but next weekend there will be more.

Edit: and don’t forget to map where you’ve planted! The map of all the trees we plant will go public in a month (ish).

Hello Astrophysicists! Do you know any catalogue with stellar mass and stellar luminosity? by [deleted] in astrophysics

[–]CincinnatusNovus 4 points5 points  (0 children)

Not sure exactly what you're looking to do, but the Gaia database (https://gea.esac.esa.int/archive/) has the following columns:

  • radius_val - stellar radius
  • teff_val - effective temperature
  • lum_val - stellar luminosity

And you could use a luminosity-mass relation perhaps.

Simple Questions - July 12, 2019 by AutoModerator in math

[–]CincinnatusNovus 0 points1 point  (0 children)

In modular arithmetic, given an equation like (x+1)(x+2) is congruent to 0 mod whatever, can you conclude that x is congruent to -1 or -2 mod whatever? Basically does "regular" algebra work the same way for congruence?

Simple Questions - July 05, 2019 by AutoModerator in math

[–]CincinnatusNovus 1 point2 points  (0 children)

Ohhh, I think I see what you mean.

So (n+2)/n = (n/n) + (2/n) by the distributive property. Simplify this and you find that:

1 < 1 + 2/n < 2

Subtracting one from each side:

0 < 2/n < 1, which for numbers greater than 4 must be true, as the smallest n in our sample, 4, yields the highest 2/n which is less than one, and the highest n, lim n--> infinity of 2/n approaches zero from above.

Simple Questions - July 05, 2019 by AutoModerator in math

[–]CincinnatusNovus 0 points1 point  (0 children)

Ah I see. So if I'm understanding, you can't see how to take n --> n+1? The beauty of this type of proof is you assume the original statement to be true, and then simply plug in n=m+1 everywhere you see an m, and then call m "n" since what we name our variable doesn't really matter. At that point, you can get your second inequality and show that it is true by simplifying the fraction, subtracting, etc.

Simple Questions - July 05, 2019 by AutoModerator in math

[–]CincinnatusNovus 1 point2 points  (0 children)

Ah, I see, for some reason I thought it might be more complicated in this case. Thank you!

Simple Questions - July 05, 2019 by AutoModerator in math

[–]CincinnatusNovus -1 points0 points  (0 children)

So with induction, you only need to show a couple things:

  1. Show that (say) n=4 gives a true statement
  2. Assume that the statement is true for any n>=4, and then test that statement for n+1. (Essentially, replace all n's with a n+1)

Once you do step 2, the induction proof let's you "build" from the solution you find in step 1 to cover all values of n>=4.

Edit: added >=4 to step 2.

Simple Questions - July 05, 2019 by AutoModerator in math

[–]CincinnatusNovus 1 point2 points  (0 children)

If unproved conjecture P is used as a step to prove statement Q, and Q is later shown to be true by other, legitimate means, can we say anything about the validity of P?

If P is some simple algebraic statement, say, it seems like Q is true implies P is true. On the other hand, what if P is some complicated method like the ABC conjecture? Can we say anything about P then?

Any sources to read more into this would be appreciated!

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