Are there any any public synchronous discussion forums (slack, discord, etc.) for Theoretical CS

I’m a 2nd year masters student studying theoretical CS (algorithms to be precise). I would like to know if there are any public synchronous discussion groups (slack, discord, etc.) on TCS. CSTheory StackExchange works well when someone has a specific question/query. I felt it would be awesome to have an online forum of people interested in TCS to discuss about various developments of the field and also talk about interesting papers and concepts.

Theoretical CS broadly encompass algorithms, complexity theory, applications of logic in CS, automata theory and also discrete math in general.

If enough people are interested we could create one in discord.

Confused in how to insert a slack variable in a constrain inequality

According to my understanding , we should put a slack variable to equate an inequality constrain by inserting the slack varaible in the side that is less than the other side , for example if we have 4x+2<2 this will be 4x+2+slack_variable=2 .But here in Wikipedia :
https://en.wikipedia.org/wiki/Slack_variable In the example section , it says the following “By introducing the slack variable y>=0, the inequality Ax<=b can be converted to the equation y-Ax+b = 0” Which means that the slack variable is inserted in the bigger side ! Please some one explain this confusion.

Hi all!!! Slack or similar apps message line length?

I just wandering why Slack don’t limit somehow lengths of message text displayed on the desktop as if we take it to full screen and don’t have any side windows opened, text in the messages is difficult to read?

Do they know that many users scale Slack window and they don’t want to hassle with that or they just say if you want you can because why not 🙂 ??

I’ve took Slack as an example of message app, but – Messenger has different approach – some limits and conversational layout.

What you think?

Slack not showing unread channels + wrong “No unread” indication

slack webapp have been acting very weird lately.

When I first log into slack, it shows everything correctly, like coloring the unread channels in bold white and providing the correct unread count.

On refresh, slacks stops showing the unread channels in bold white. I can still see them in the All Unreads though, which still makes this tool usable.

But, when I click on any starred channel and then back to All Unreads, I see that all is read, though it isn’t!!!

Again, refresh shows the correct number of unreads but doesn’t show the unread channels.

I tried signing out and in. Tried clearing the cookies.

I’m using a fresh install on Ubuntu 18.04 on chrome v 75.0.3770.100. Same issue on firefox as well.

enter image description here

telegram, slack, skype won’t run if I put them on startup applications

I have run telegram, slack, skype on startup application ubuntu 16.04

enter image description here

But, the icon doesn’t appear in taskbar (notification area). Howver, it appear as run application

 $   ps ax | grep skype  3854 ?        SLl    1:59 /usr/share/skypeforlinux/skypeforlinux --executed-from=/home/pujangga --pid=3847  3864 ?        S      0:00 /usr/share/skypeforlinux/skypeforlinux --type=zygote --no-sandbox  3985 ?        Sl     1:33 /usr/share/skypeforlinux/skypeforlinux --type=renderer --autoplay-policy=no-user-gesture-required --ms-disable-indexeddb-transaction-timeout --no-sandbox --service-pipe-token=EF831309DDA5DEFF9BDFE0351F93886A --lang=en-US --app-path=/usr/share/skypeforlinux/resources/app.asar --node-integration=false --webview-tag=true --no-sandbox --native-window-open --preload=/usr/share/skypeforlinux/resources/app.asar/Preload.js --background-color=#fff --num-raster-threads=4 --enable-main-frame-before-activation --enable-compositor-image-animations --service-request-channel-token=EF831309DDA5DEFF9BDFE0351F93886A --renderer-client-id=4 --shared-files=v8_context_snapshot_data:100,v8_natives_data:101 --skype-process-type=Main  9924 pts/16   S+     0:00 grep --color=auto skype 

When I try to run it unity dash, it won’t start too. I need to killall skypeforlinux to make it run through dash menu