## What does notation \$\inf_{k,l}\$ mean for indices \$k,l\$?

What does notation $$\inf_{k,l}$$ mean for indices $$k,l$$?

Does it mean that one picks $$\inf k$$ and $$\inf l$$ or that one picks some kind of “inf of both $$k$$ and $$l$$” (whatever that means)?

## What does ‘stage’ mean in git?

I find git hard to understand as I could not find the meaning of the words used for the actions. I have checked the dictionary for the meaning of ‘stage’ and none of the meanings were related to source control concepts.

What does ‘stage’ mean in the context of git?

## What does it mean: Visa processing Times” you need to “Select the location you are making your application from”

1) under UK Gov site to see “Visa processing Times” you need to “Select the location you are making your application from”

2) The way I read it, that it means either my town, my state or my country.

3) However, in drop down menu it offers limited cities and countries together.

a) It has a few major cities like Chicago, NY and DC, but nothing near me.

b) It does have a option for DHS-Vac, USA, which googled is “Application Support Centers”

4) What exactly does that mean?

5) Since it seems to have limited options, I don’t really understand exactly what it means “Select the location you are making your application from”.

## What does it mean by “consistent view of memory” in lock-free dequeue implementation?

I am currently reading this paper by Chales-Lev. This paper explain an implementation of work-stealing dequeue. The part where I don’t understand is in the implementation of steal operation.

``public Object steal() { 11 long t = this.top; 12 long b = this.bottom; 13 CircularArray a = this.activeArray; 14 long size = b - t; 15 if (size <= 0) return Empty; 16 Object o = a.get(t); 17 if (! casTop(t, t+1)) 18 return Abort; 19 return o; } ``

I am confused by this sentence on page 3 regarding this implementation:

Note that because top is read before bottom, it is guaranteed that the values read represent a consistent view of the memory. Specifically, it implies that bottom and top indeed had their observed values when bottom was read at Line 12.

But I still don’t understand the sentence above. What does it mean by consistent view of memory? Even though I already find the reason why I must load top first before bottom, I afraid there is a concept that I don’t understand here.

## What does “bounded above” mean in Family of Bachmann–Landau notations?

Per wiki

|f| is bounded above by g (up to constant factor) asymptotically

with this concrete example,

$$f(n) = \log n$$

$$g(n) = n^c = n^{0.000001}$$

Does “bounded above (up to constant factor)” means $$f(n)$$ is above $$g(n)$$

## The mean value of phase noise as a stochastic process

1. What is the mean value of phase noise as a stochastic process?
2. Where can I get a theoretical analysis of this topic?

PS: PLL produces cos(2*πfct+φ(t)). The phase noise refers to φ(t). The mean value of the phase noise what I say refers to the mathematic expectation of phase noise stochastic process φ(t), namely E{ φ(t) }.

## Pi, what does it mean? [on hold]

What is your knowledge of the relationship between the numbers in pi? The only number before the decimal place is 3, then .14, then 0.00159. Apparently the number goes on forever, but it makes sense they are equal. If the number was created with the side to the left of the decimal representing the speed of light in a vacuum and to the right speed of light, the number to the right would be slightly less than to the left. But light in a vacuum isn’t a real situation, as a whole. A theoretical equation.So what do the numbers represent? Assume the formula for pi is 30 = 14 + 16. And I’m interested in solving questions about how earth, the sun and moon interact with each other. What do those numbers represent?

## which technology I mean. java, php,.net, python wordpress on aws ec2 instance is used for webservices and where is db?

I am new to AWS EC2. Actually, there is already services created and deployed on AWS EC2 but I do not know which technology used. And for that, where is source code and database. I am provided with public DNS, Through which I can connect to instance using ssh command etc. I need to know which language and technology is used for services.These services were created/ written for mobile devices cross platform. But in which technology?