i find it intriguing how ingredients have traveling the world and things associated with certain regions (think potatoes in ireland) are historical imports
During lockdown, when online food delivery was not available in plenty, I would watch his videos to make food. He also talks about history of the food he's cooking -like why the food got that name, which country it originated in etc. I like that.
copper: I think you know -samosa. I was shocked to know that it did not originate in India.
And preparation techniques. There is a phenomenally good cuisine in northern Baja which is, essentially, Mexican ingredients (peppers, corn, etc) prepared using Chinese (mostly Szehuan) techniques.
@TedShifrin Kind of. Most agrarian societies have some kind of dumpling. Many / most hunter/gatherer societies do not (they don't produce the grain to make dumplings).
Hello everyone, I am a beginner in the topology course, and I have one question. I know that we can induce topology from metrics, but is it somehow possible and vice versa? To induce metrics from topology? I guess not always but is it ever and if so when and how?
I checked on other device. \mathcal {L} gives an L on other devices though. I noticed it as I lately have been seeing lot of boxes on mse and I wondered why people started using boxed all of a sudden.
Question: Show that $f(A) = A^2$ is differentiable function mapping $M_{n\times n}$ to $M_{n\times n}$
In a previous question we showed that for any $A,B \in \mathscr{M}_{n\times n}$ ,
$D_{B}(A) = AB + BA$
to show the proposed map is differentiable we would show
$\lim\limits_{\textbf{h} \to \text...
So since you are here, all this arose from me reading over the Lagrangian chapter and specifically the derivative of $f(x) = Ax \cdot x$ being $Df(a)h = Aa \cdot h + Ah \cdot a$. You didn't assign that question so I came back to do it. I'm on this one specifically now.
How do you derive the formula foe $Df(a)h$? is it similar to the idea we used to get the derivative of $f(x) = \|x\|$?
@DarwinZou It probably would be better to discuss fusion in the Physics chat. chat.stackexchange.com/rooms/71/the-h-bar It's a bit quiet over there right now, but if you post now people will respond later.
@Thorgott Apparently the notion of an order (subring of a ring of integers) is the relevant one, and the few results on number rings that I need to know are quite similar to those of orders. Luckily my books cover orders
