Mathematics

@Ilya Here, chai usually refers to a mid-eastern spiced tea. I know that one of my park friends is from Russia and he always tells me when I mention chai, that that just means tea to him.

Michael Greinecker

@Ilya Did not know there are Chinese ones.

Ilya

@robjohn icic

Michael Greinecker

@robjohn @Ilya en.wikipedia.org/wiki/Masala_chai

Ilya

4:25 PM

@MichaelGreinecker discover something new every day :)

@MichaelGreinecker @robjohn: well, I usually prefer black teas with some spices. I was also drinking tea with milk when I was younger, but not anymore. Only with lemon sometimes

user58512

I want that

Ilya

@MichaelGreinecker: when I first read Chapter 7 of Bertsekas and Shreve, I was much surprised that such... practical guys wrote such a book

I knew their other books before

robjohn

@MichaelGreinecker that's pretty close

@Ilya I generally don't have milk, except for a chai mix that has dried milk in it already

Michael Greinecker

@Ilya I knew Shreve's finance book and that Bertsekas wrote lots of optimization books.

Ilya

@robjohn do you cook it by yourself, or you only need to add some water?

@MichaelGreinecker Shreve's finance is not very technical, neither is "Dynamic programming" Vol. 1,2 by Bertsekas

robjohn

4:31 PM

@Ilya usually, it is just tea, spices, and honey

Ilya

@robjohn icic

robjohn

@Ilya Brew the spiced tea leaves, add honey :-)

Ilya

hm, that we also do

good when you're cold

robjohn

@Ilya Very good. If you refrigerate it, it is good cold for hot days.

Ilya

better also add milk and some rasberry jam

Michael Greinecker

4:32 PM

gotta go briefly, bye folks

Ilya

bye!

robjohn

@Ilya jam in tea? Never considered trying that. I will take your word for it

@MichaelGreinecker have fun

Ilya

@robjohn I'm not kidding

@robjohn: until recent times, cold tea has not been popular in Russia

for obvious reasons

robjohn

@Ilya I didn't think you were. I just was not going to be trying that this morning.

Ilya

tea is ought to be drunken during long cold dark nights

@robjohn well, it depends on your taste, but helps smoothing one's throat when having a cold

robjohn

4:34 PM

@Ilya We will have a fire tonight and I will make tea (chai and jasmiine teas) and have them while it rains outside.

@Ilya Honey and sometimes lemon work for me

Ilya

@robjohn sounds cool :)

Nimza

Hello! Who does know, what is a "vanishing Lagranian" or "zero Lagrangian" by definition in variational calculus? I know that it isn't $L \equiv 0$!

Ilya

maybe, it is vanishing out of compacts? would it make sense in your problem?

ah, Lagrangian

Nimza

@Ilya No, Ilya, here is a theorem without proof that any vanishing Lagrangian $L(x,z,p)$ has a form $S_{x}(z,p)+S_{z_i}(x,z)p^{i}$

Ilya

Lagrangian, you meant?

Nimza

4:38 PM

@Ilya yep, oh La-La

Ilya

:D

why don't take it as a definition?

robjohn

@Nimza In the sense of a critical point?

@Nimza That looks like a function whose Lagrangian vanishes

Nimza

@robjohn hm, not sure, but it is true that if we solve problem of minimization $F(u) = \int_{a}^{b}L(x,u(x),u'(x)) \, dx \to \min$ then in neighborhood of optimum we have $F(u) = S(b,u(b)) - S(a,u(a))$, so there are no dependence on what happens inside $[a,b]$

user58512

> The reason it is difficult to convert results about low lying zeros to results about small primes is that the Explicit Formula, (mentioned in comments above) has the primes and zeros lying on opposite sides of a Fourier Transform. The Heisenberg Uncertainty Principle applies

where is the fourier transform?