turing machines: a downward push robot with two piles that is equivalent to a linear limit automaton

It is known that a PDA with two batteries is equivalent to a TM.

On the other hand, a PDA with a stack is capable of recognizing only context-free languages.

Therefore, there is a kind of gap between the PDA class with a battery and the PDA class with two batteries that must be able to recognize only context sensitive Languages

I feel that it should already be a question examined, but I could not find an answer: what restrictions should we apply to a PDA with two batteries to be equivalent to a linear limit automaton?

python – Alternative to "for" equivalent to LINQ from Where?

I have a CSV file contained in a variable raw_data. I just need certain rows depending on whether the first element of the row (row_split[0]) matches a price number. The following code works fine, however, coming from a C # background. I know there is an equivalent of LINQ. Is there something in Python that I use? Where or Any which also includes the row.split (& # 39;, & # 39;).

for the row in raw_data:
row_split = row.split (& # 39;, & # 39;)
if str (row_split[0]) == price number:
filter_data.append (row)

Actual analysis: Prove that $ vert vert vert vert cdot vert vert vert $ is equivalent to $ vert vert cdot vert vert_ {1} $

Leave $ vert vert vert cdot vert vert vert $ be a norm in $ ell ^ {1} $ with the following properties:

$ 1. $ $ ( ell ^ {1}, vert vert vert cdot vert vert) $ is the Banach space

$ 2. $ for all $ x in ell ^ {1} $: $ vert vert x vert vert _ { infty} leq vert vert vert x vert vert vert $

Show, using the closed graph theorem that $ vert vert vert cdot vert vert vert $ It is equivalent to $ vert vert cdot vert vert_ {1} $.

My idea:

Define $ J: ( ell ^ {1}, vert vert vert cdot vert vert vert) a ( ell ^ {1}, vert vert cdot vert vert_ {1}) , x mapsto x $

I need to show that $ J $ It is a closed operator, as $ ( ell ^ {1}, vert vert vert cdot vert vert) $ Y $ ( ell ^ {1}, vert vert cdot vert vert_ {1}) $ They are already banach.

Then leave $ (x ^ {n}) n subseteq ( ell ^ {1}, vert vert vert cdot vert vert vert) $ where $ x ^ {n} xrightarrow {n a infty} x $ Y $ exists and in ( ell ^ {1}, vert vert cdot vert vert_ {1}) $ so that $ Tx ^ {n} xrightarrow {n to infty} and $. Now, how can I show that? $ Tx = y $

And then, how am I going to show that $ ( ell ^ {1}, vert vert vert cdot vert vert) $ is closed?

reverse proxy: Nginx proxy_pass equivalent for the Rsync daemon?

I am administering a open source mirror software (for example, mirrors.example.com) that provides HTTP (S) and Rsync services. There is only one domain and the content is served from different URIs, such as mirrors.example.com/ubuntu Y mirrors.example.com/debian.

Some of the duplicate repositories are moving to another data center soon, and I'm planning to minimize public impact by distributing traffic down, since the network bandwidth in both data centers is far from being loaded. As the HTTP (S) service is running in OpenResty, proxy traffic is easy with proxy_pass. I wonder if it is possible to do something similar with Rsync. that is, an incoming request to rsync: //mirrors.example.org/some_repo would reach the original data center, but the actual content would be obtained from the new data center (proxy) in a manner similar to that of Nginx.

Note: load balancing is not feasible here due to lack of disk capacity, so different content must be served from different data centers.

geometry – Find all points X in C: x ^ 2 + and ^ 2 = 1 in such a way that the vector OX is orthogonal to a fixed vector equivalent to the free vector PX where P (0, p)

Find all the points X in C: x ^ 2 + and ^ 2 = 1 so that the vector OX is orthogonal to a fixed vector equivalent to the free vector PX where P (0, p) says the conditions in p

I tried this X (0.8,0.6) is a point in C and then vector OX =[0.8,0.6]
I made a fixed orthogonal vector first OH =[0.6,-0.8],
then the free vector has to be PX =[0.8,-0.8]

P (0,1.4) because 0.6-p = -0.8

So I came to the conclusion that p has to be x + y where x and y are the coordinates of point X, but it does not work for all the points and I do not know what I'm doing wrong, can you help me? ?

r – What is the ggplot2 equivalent of graphics :: clip

the shorten The function helps establish a clipping region in the base graphics. For example, if I simulated some observations in 2-d, I can only plot the observations in the fourth quadrant as follows:

dataset <- data.frame (x = runif (n = 100, min = -1, max = 1),
y = runif (n = 100, min = -1, max = 1))

graphic (x = data set, type = "n")
abline (h = 0, v = 0)
usr <- par (& # 39; usr & # 39;)
the clip limits (x1 = 0, x2 = 1, y1 = -1, y2 = 0) are enough for this toy
points (x = data set, pch = "x")

do.call (clip, as.list (x = usr))

Created on 2019-07-04 by the reprex package (v0.3.0)

How can I do the same in ggplot2? Of course, I can filter the observations first, but I'm looking for a way to find a direct alternative.

How to channel a remote shell script to windows equivalent to bash

So I just learned (similar to homebrew) that you can evaluate remote scripts using this:

bash <(curl https://foo.bar)

Something like that. Now I would like to do the same for windows. Without installing anything that does not come preinstalled in windows..

bitsadmin / transfer myDownloadJob / download / normal priority http: //downloadsrv/10mb.zip c:  10mb.zip

That seems to be the approach to download files in Windows. So I'm wondering how to take something like that and evaluate it, since it's downloading like this. If it is not possible, then any standard solution would be useful.

abstract algebra – two definitions of graduated modules, are they equivalent?

I have seen two definitions of graduated modules.

Definition 1: Given a graduated ring $ R = bigoplus_ {n in mathbb {Z}} $ a $ R $-module, $ M $ It is a qualified module if $ M $ can be expressed as a direct sum (as an abelian group) $$ M = bigoplus_ {n in mathbb {Z}} M ^ n $$ such that $$ R ^ kM ^ j subseteq M ^ {k + j}. $$

Definition 2: A qualified module is an indexed family. $ M = (M_p) _ {p in mathbb {Z}} $ of $ R $-modules for some ring $ R $.

I assumed that these two definitions would be equivalent in some way (because they are two definitions of graduated modules that I have seen in two different books), but I do not know how they would be shown to be equivalent, because in the first case a qualified module is, in fact, a module and in the second, a qualified module is just a family of modules.

For now let's concentrate on testing that definition. $ 2 $ implies definition $ 1 $. Yes $ M $ It is a qualified module in the sense of definition. $ 2 $ so $ M = (M_p) _ {p in mathbb {Z}} $. Now, first of all, I can do $ R $ in a ring graduated naturally by defining $ R ^ 0 = R $ Y $ R ^ i = {0_R } $ for all $ i neq 0 $. So $ R = bigoplus_ {n in mathbb {Z}} R ^ n $ Y $ R ^ nR ^ m subseteq R ^ {n + m} $ manufacturing $ R $ in a graduated module. Also if we define ourselves $ M & # 39; = bigoplus_ {p in mathbb {Z}} M ^ p $ then we would end up with a qualified module in the sense of definition $ 1 $.

But this does not really show that definition $ 2 $ implies definition $ 1 $, because it's not like I've taken any degree $ R $-module $ N $ in the sense of definition $ 2 $ and it shows that he is a graduate $ R $-module in the sense of definition $ 1 $.

Are these two definitions of fact equivalent? If so, how can I prove they are?

dnd 5e – Does 5e have an equivalent of Doctor Who's psychic role?

Ultimately, the Doctor simply convinces someone that the document says something that makes sense to the viewer.

This can be done with the spell. suggestion:

You suggest a course of activity (limited to a sentence or two) and magically influences a creature that can see within range that can hear and understand it. Creatures that can not be enchanted are immune to this effect. The suggestion should be drafted so that the course of action appears reasonable. Asking the creature to stab itself, throw itself on a spear, blow itself up or do some other obviously damaging act ends the spell.

Course of action?

The potential problem here is how to interpret the "course of action". Usually, that implies that the suggestion is to make the goal "do" something. Yes or no "You read this paper to show that I am [X]"It is considered that an & # 39; course of activity & # 39; will depend on a DM to determine, but it is costing me find a good reason why it will not work.

Difference of the psychic paper

The big difference here is that you need to "indicate" the goal on how to read the document. I think it still works from a Doctor Who perspective suggestion To cover this, but it's a little more stupid.

networking – Command to show the equivalent of "ipconfig / all"

Command to show the equivalent of "ipconfig / all"

There's a program or command to show all the network information (Subnet mask and IP, gateway, DNS servers, host name, DHCP lease information, DHCP server) … conveniently with a command, like the built-in Windows ipconfig / all make? I have searched and searched, but the results of the online search still show "10 useful Linux network commands". If you do not know, you do not have to warn me when commenting that you do not know, or go beyond creating a script to do this-n-that. I just look to see if there is some progress to do this 🙂

SO: Kubuntu 18.04.2 LTS Kernel: 4.18.0-25-Generic shell: bash 4.4.19