SERVING THE QUANTITATIVE FINANCE COMMUNITY

katastrofa
Posts: 6370
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

No. The yolk part of an egg has a smaller variance than the white part. The commercial eggs are bigger (have bigger whites or two yolks) because they hens hormonally stimulated and fed more protein. Generally big eggs are not healthy either for those who eat them or the hens who have to lay them.

Collector
Posts: 3914
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

what is the standard when it comes to units

$\frac{G\times 1 \mbox{ weight unit}}{c^2}=\frac{G}{c^2}= \mbox{ meter}$

that is output unit is meter as I am looking for in this case, but one could claim

$\frac{G}{c^2}$ alone not give meter output, but  $m\cdot kg^{-1}$ as output, since G is of form $m^3\cdot kg^{-1}\cdot s^{-2}$

In other words can I write just $\frac{G}{c^2}$ and claim output is in meter, because I actually have $\frac{G\times 1 \mbox{ kg}}{c^2}$, or should I then write out as  $\frac{G\times 1 \mbox{ kg}}{c^2}$ every time, as then evident output is meter. When multiplying with 1 (unit of something) it naturally only changes the units, not the output number.

katastrofa
Posts: 6370
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

Writing another groundbreaking scientific paper or book? The standard is using square brackets (see dimensional analysis).

Collector
Posts: 3914
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

yes i know that (, but seems no one has walked this particular theritory...

"Writing another groundbreaking paper"

yes writing a paper, it is not groundbreaking, it is breaking G, not the ground. To break the ground I use my new Lamborghini, except close to my hedge where I have to do fine cutting off long grass by hand (to not damage the Hedge with my over sized Lamborghini) , where the damn snake was hiding. Some hedges are more risky than others!
Last edited by Collector on August 18th, 2018, 9:02 pm, edited 1 time in total.

katastrofa
Posts: 6370
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

I've seen different conventions, but I think the standard is:

$[\frac{G}{c^2}] \cdot{kg}= \mbox{meter}$ - if you want to talk about units.

$[\frac{G}{c^2}] \cdot{M}= \mbox{L}$ - if you want to talk about dimensions (L and M are length and mass).
Last edited by katastrofa on August 18th, 2018, 9:09 pm, edited 2 times in total.

Collector
Posts: 3914
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

good

katastrofa
Posts: 6370
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

You're welcome.

BTW, maybe you should follow Paul's example and take fancy of long grass?

Collector
Posts: 3914
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

then he is a hippie! I am not!

katastrofa
Posts: 6370
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

To me, both you and Paul are completely alien species.

bearish
Posts: 3767
Joined: February 3rd, 2011, 2:19 pm

### Re: Stupid question of the day

i have met both of them, and they're not completely alien. Originals? Yes!

Collector
Posts: 3914
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

Looks like I need the Lambert W function to find some type of maximum I am looking for. In mathematica this is ProductLog function, dose it also exist built into excel under some name?

also since I am new to the Lambert W function, is there any interesting stuff I should know about it? Implementation wise or otherwise?

ppauper
Posts: 69040
Joined: November 15th, 2001, 1:29 pm

### Re: Stupid question of the day

In maple, it's LambertW(x)

I first came across it in maple when for some insane reason they decided to make it just "W(x)" in the then-latest version, and since everyone was using (U,V,W) for velocity, it didn't exactly go down well. And they didn't even tell you that W(x) had suddenly become the LambertW function. I had codes that were supposed to be finding W(x) and they were giving gibberish because W(x) had already been defined by the system

I' m sure mathematica can plot it and evaluate it.

Collector
Posts: 3914
Joined: August 21st, 2001, 12:37 pm

### Re: Stupid question of the day

yes Mathematica can do it, still struggling with the intuition behind Lambert W...should be a simpler method (to find my Omega point) ...

Closed-Form Representations Of The Lambert W Function

Also

ANOTHER INCARNATION OF THE LAMBERT W FUNCTION

"The Lambert W function was introduced by Euler in 1779, but was not well-known until it was implemented in Maple, and the seminal paper..."

katastrofa
Posts: 6370
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

### Re: Stupid question of the day

Maybe Maple made it well-known to computer guys, but solid state physicists have been using W for solving the particular type of differential equations since Lambert came up with his method.

Cuchulainn
Posts: 57022
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

### Re: Stupid question of the day

i have met both of them, and they're not completely alien. Originals? Yes!
I met one of them; what's the other one like?