## why do these two Meijer G functions not cancel each other?

I encountered such expressions in Mathematica

``````MeijerG({{}, {1, c + 1/2}}, {{0, c, c, c}, {}}, 1)+MeijerG({{1}, {c + 1/2}}, {{c, c, c}, {0}}, 1)
``````

which in the notation of Wiki is given by the sum of the following Mellinâ€“Barnes integrals
$$G_{2,4}^{4,0}left(left.begin{array}{c} 1, c+frac12\ c,c,c,0end{array} right| 1right) = frac{1}{2pi i} int_Cfrac{Gammaleft(-sright)Gammaleft(c-sright)^3}{Gammaleft(1-sright)Gammaleft(c+frac12-sright)} ds = – frac{1}{2pi i} int_C frac{ Gammaleft(c-sright)^3}{sGammaleft(c+frac12 -sright)}ds$$
and
$$G_{2,4}^{3,1}left(left.begin{array}{c} 1, c+frac12\ c,c,c,0end{array} right| 1right) = frac{1}{2pi i} int_C frac{Gammaleft(sright) Gammaleft(c-sright)^3}{Gammaleft(1+s right)Gammaleft(c+frac12 -sright)}ds = frac{1}{2pi i} int_C frac{ Gammaleft(c-sright)^3}{sGammaleft(c+frac12 -sright)}ds$$
and both contours $$C$$ should be chosen to be the one beginning and ending on $$+infty$$. Therefore two Meijer G functions should be exactly opposite to each other and the sum is identically zero, right?

However, Mathematica yields very different result, by which I mean numerical evaluation of the function with some value of $$c$$ plugged in. I am wondering what is causing the problem?

## usability – Why is a cancel “X” icon required if there is already a “Cancel” option in a modal?

We could talk about mental models
Users project their knowledges from another softwares, platforms, with this in mind we understand users sometimes prefer the X button instead the cancel, for many reasons, more faster, they don’t need or understand another buttons bar, and will spend more trust.

When we see a notification popup asking for user accept or decline, I heard from many users they prefer close for X button, instead click over Sorry No, because in their mind they imagine, “If I click in button Sorry no, something will happen and I don’t wanna this”. All of this, is because their project their knowledge.

## uk – Do airlines book you on other airlines if they cancel flights?

Do airlines book you on other airlines if they cancel flights?

Yes, that happens from time to time. It happened to me last year. Because of a flight cancellation from Munich to Newark, Lufthansa booked me on a KLM flight from Munich to JFK via Amsterdam. They actually offered a few options, but I chose the one with the change in destination because I live rather closer to JFK than to Newark.

can I expect them to rebook me onto a direct flight e.g. with British Airways or Singapore Airlines or some other route if such a possibility exists?

I don’t know whether you can expect that. It’s very difficult to predict what may or may not happen in these unusual times.

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Suppose that I, as an user, have to fill a google form. On a certain multiple-choice question, I choose the answer `yes`. Then, I recognize that I’m not sure it is the right one, so I want to cancel it. Is it possible? I’m unable to undo my choice.

## How to cancel an announced Android System update

You can not cancel the update itself because it has already been applied.

Modern Android devices have the system partition twice (called A/B partition). One that is currently active and one that can be used for installing updates “seamless” (so called by Google). Which partition is currently active on next boot can be changed.

The screen you show means that an update has been downloaded and installed on the non-active partition. The only step left is rebooting into the updated partition.

I am not sure if you do the reboot but not switch to the updated partition. No matter even if you would manage to do so I assume that the system would start to download and re-apply the update again on the other partition and then ask for rebooting into it to finish the update.

## How to cancel a book for Android System update

I wrongly click the button to book a update for Android System.

How can I cancel it before Nov 22 after 02:00

## javascript – Name for an async job queue where enqueued jobs cancel pending jobs

Can you help me figure out the name of this object/operation?

I’m writing a form which automatically kicks off a sluggish async job to render a live preview of the results every time the form changes. These automatic jobs should execute sequentially. If the user changes the form before the job is done, the new job should be queued while the running job completes. But if there are other queued up jobs, the other pending jobs should not run. I think I know how I want it to work, and I think I even have a good enough implementation:

``````class WhatIsThis {
constructor () {
this.pending = {
promise: Promise.resolve(),
tryCancel: false
};
}

queue(asyncAction) {
this.pending.tryCancel = true;
const pending = this.pending = {
tryCancel: false,
promise: (() => {
const doAction = () => pending.tryCancel
? { canceled: true }
: asyncAction();
return this.pending.promise.then(doAction, doAction);
})()
};
return pending.promise;
}
}
``````

But, I just don’t know what to call it. It’s not a new concept, it’s not quite a debouncer, and it’s not quite a job/task queue. What is this thing?