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2026-09-24 21:47:41
2026-09-23 19:05:19
2026-09-23 19:05:19
22890261
2026-07-23 14:56:22
2026-07-23 00:56:44
2026-07-23 00:56:44
21713061
in reply to Jonathan Lamothe
question about math notation
Unknown parent
in reply to Jonathan Lamothe
question about math notation
in reply to Jonathan Lamothe
re: question about math notation
you will see a few variations on this if you look around. I would write it like this, but you can write basically anything unambiguous. You see notation like "a | n" or "g ∈ G" under summation symbols to represent summation over the divisors of n and elements of G, respectively, so it's pretty casual.
in reply to Fish Face
re: question about math notation
in reply to Jonathan Lamothe
in reply to Fish Face
This question doesn't lend itself well to plain text, so I LaTeX'd and screenshotted it. I'll do my best with the alt text.![Is there a way of writing the expression<br>\[ \sum_{n=1}^m f(n) \]<br>in a way that omits the term where $n=a$?</p><p>I know it could be written as<br>\[ \left( \sum_{n=1}^m f(n) \right) - f(a) \]<br>but this doesn't work when $f(a)$ is undefined.](https://social.jlamothe.net/photo/13528377976a61653463c9a386467268-1.png "Is there a way of writing the expression<br>\[ \sum_{n=1}^m f(n) \]<br>in a way that omits the term where $n=a$?</p><p>I know it could be written as<br>\[ \left( \sum_{n=1}^m f(n) \right) - f(a) \]<br>but this doesn't work when $f(a)$ is undefined.")
#math #maths #mathstodon #AskFedi
Edit: It turns out that Friendica has a MathJax addon. Who knew?
Also, it seems like there are a number of options. The one I like best is:
$$\sum_{\begin{matrix}1 \le n \le m\\n \ne a\end{matrix}} f(n)$$
Edit 2: It looks like this doesn't render properly when federated to a server without MathJax support. I suppose I should've seen that coming.
Mathematics Channel reshared this.
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math.stackexchange.com/questio…
I'm gonna miss stack exchange.
Summation with exclusion
Commonly we use $\sum$ symbol to compactly describe the sum of a collection or a series, e.g. $\sum_{i=1}^{5} = 1 + 2 + 3 + 4 + 5$. Is it possible to describe the summation with a number removed fr...Mathematics Stack Exchange
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You can using domain notation - 1<=x<=m, x><a - but I don't think I've ever seen domain notation used with a sigma
This entry was edited (Thursday, July 23, 2026, 9:29 AM)
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you will see a few variations on this if you look around. I would write it like this, but you can write basically anything unambiguous. You see notation like "a | n" or "g ∈ G" under summation symbols to represent summation over the divisors of n and elements of G, respectively, so it's pretty casual.
This entry was edited (Thursday, July 23, 2026, 2:58 PM)
Jonathan Lamothe likes this.
@Fish Face Yeah, I've gotten a couple answers, but I think I like this one the best.
I'm gonna be honest, I only saw your comment because I monitor the replies of one of the other respondents so I can fix his... attempts to be helpful. Unfortunately due to the way the Fediverse works, this means I didn't see you had already got a legit answer!
@Fish Face No worries. Federation can be weird like that. If I get an overwhelming number of answers to my question, I'll usually add an edit to the original for that reason.
2026-04-16 12:59:55
2026-04-15 18:16:50
2026-04-15 18:16:50
19895569
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@Dave Marquardt Emacs: 28.2, Gnus: 5.13
@davemq vanilla emacs: just install nnatom. it's not out of the box.
@superketchup @Dave Marquardt It does not appear to be in the default repositories, nor melpa.
😱 mail.gnu.org/archive/html/emac… … but I can't find the source code anymore. big problem. good news: if you update emacs, nnatom should be included.
This entry was edited (Thursday, April 16, 2026, 5:57 AM)
@superketchup Right, I started using nnatom in the past few weeks and noticed its part of Gnus now. I've also running Gnus v5.13. Maybe there was no version bump when they brought nnatom in?
I had problems getting nnatom to work. IIRC it does not want http:// or https:// when specifying the server, unlike nnrss.
I might have the same problem but haven't investigated it for now...
2026-04-12 21:19:32
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19823755
elisp help
...but this doesn't actually copy the old function, just a reference to the symbol, so it ends up locking itself in a recursive loop.
Edit 2: It turns out there's a cleaner way still.
See: aus.social/@carlozancanaro/116…
in reply to Jonathan Lamothe
elisp help
The idea is to hash the Message-ID header in outgoing mail because Gmail seems to have decided the original format looks like spam.
#emacs #elisp #AskFedi
in reply to Jonathan Lamothe
in reply to Daniel
in reply to Jonathan Lamothe
elisp help
in reply to Carlo Zancanaro
elisp help
in reply to Jonathan Lamothe
elisp help
in reply to Jonathan Lamothe
in reply to Jonathan Lamothe
in reply to Greg A. Woods
Okay, I need to do a hacky #elisp thing. Yes, I know it's terrible.
Basically, I have an existing defun. Let's call it foo. I need to replace it with a new function that calls the old one and transforms its output before returning it.
I naïvely assumed I could do it like this:
(let ((oldfunc (function foo)))
(defun foo ()
(my-transform (funcall oldfunc))))...but this doesn't actually copy the old function, just a reference to the symbol, so it ends up locking itself in a recursive loop.
I'm sure there's a way to do this.
#AskFedi
Edit: Got it. It's:
(let ((oldfunc (symbol-function 'foo)))
(defun foo ()
(my-transform (funcall oldfunc))))Edit 2: It turns out there's a cleaner way still.
See: aus.social/@carlozancanaro/116…
Also, there's still something Gmail isn't liking. Looking at the differences in the headers between emacs and my other clients (whose mail does get through), the next most obvious difference is that the Content-Type header doesn't specify an encoding. Whether this is the actual problem or not, I should probably fix that. I'm just working on how.
The usual way to do this would be to "advise" the function with an "around" advice. gnu.org/software/emacs/manual/…
Okay, so I wrote this hacky nonsense in my ~/.emacs.d/init.el, but it doesn't seem to be having any effect. The function in question seems completely unaffected.
Perhaps this code is being evaluated before the original function is defined?
;; Mail hack
(defvar jrl-mail-hack nil
"Flag to prevent from overloading the function a second time")
(let ((oldfunc (symbol-function 'message-unique-id)))
(unless jrl-mail-hack
(defun message-unique-id ()
(secure-hash 'sha256 (funcall oldfunc)))
(setq jrl-mail-hack t)))The idea is to hash the Message-ID header in outgoing mail because Gmail seems to have decided the original format looks like spam.
#emacs #elisp #AskFedi
I'm definitely not an expert, but could it be the (let ...) statement causing a problem? Can you move the (unless) outside? I wonder if your changes to the function only apply inside the scope of let.
This entry was edited (Sunday, April 12, 2026, 3:41 AM)
@Daniel It turns out that the better solution was here:
The usual way to do this would be to "advise" the function with an "around" advice. gnu.org/software/emacs/manual/…
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The usual way to do this would be to "advise" the function with an "around" advice. gnu.org/software/emacs/manual/…
Jonathan Lamothe likes this.
@Carlo Zancanaro Well, that's much nicer than the abomination I wrote.
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Here's a cleaner version that should work. However, I'd be surprised if it's actually the message IDs that are the problem.
```
(defun jrl-message-unique-id (orig &rest args)
"Hash the output of ORIG.
ARGS are passed on to ORIG"
(secure-hash 'sha256 (apply orig args)))
(advice-add ''message-unique-id :around #'jrl-message-unique-id)
```
Jonathan Lamothe likes this.
No, you can't do that, especially not in elisp.
However there's defadvice sitting just around the corner waiting to help you solve your problem.
See also:
lispworks.com/documentation/lw…
emacsninja.com/posts/a-piece-o…
stackoverflow.com/questions/15…
Preferred method of overriding an emacs lisp function?
I have rewritten and stand-alone tested the behaviour of an inner function invoked by one of the Emacs functions bundled with Emacs 24. What is the preferred way of incorporating - e.g. in my init....Stack Overflow
Of course there's a question about your underlying logic lurking here: Why don't you just define a new function that calls the old function and transforms its output and then just call the new function.
Transforming the output of an existing function risks breaking all other callers of that function.
@Greg A. Woods Because it's not a function I ever actually call directly, and it's buried pretty deep in the internals.
2026-01-14 08:41:16
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Hey all,
I have a friend who's been trying to get on Mastodon but tells me that it doesn't seem to play well with screen readers. I know there are plenty of people on the fedi who do use screen readers, but I have no experience with them myself, so I can't really direct him.
Can someone who does use a #ScreenReader point me in the direction of some resources that might be useful?
#AskFedi #a11y
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My understanding is that some alternate clients, particularly semaphore.social/, play better with screenreaders? That's what my friends here who use screenreaders have told me, at least. I'll boost this so they can chime in as more authoritative sources.
Hey @pawpower @wx1g @RareBird15 @matt @WittiePenguin @Fragglemuppet any suggestions for screen readers that work well with Mastodon? The OP above this toot is asking for a friend.
@adhdeanasl @wx1g @RareBird15 @matt @WittiePenguin @Fragglemuppet For some reason I can't see the toot you're referring to but how is the person accessing Mastodon, IE iPhone, PC Android ETC?
@The Witchy Bitches @👩🦯The Blind Fraggle @Matt Campbell @ADHDeanASL @Panamanian❤️🔥 @Superdave! @Lanie I believe he's recently switched to a Linux distribution* (which I understand doesn't play well with screen readers to begin with). I can ask him for more details. Unfortunately he's in the UK, so I can't assist in person.
* I don't know which.
👻 Furbland's Very Spooky Account™ 👻 reshared this.
@adhdeanasl In that case, I'd reframe the question as which Mastodon client is most likely to work with a screen reader on a non-Windows desktop platform. I suggest Semaphore (semaphore.social/), a web-based client.
@adhdeanasl Oh, my mistake. It looks like Semaphore is gone, and I've been using a cached local version for an unknown length of time. In that case: enafore.social/
Home · Enafore
A fediverse client with better support for Akkoma, glitch-soc, and Iceshrimp instances.enafore.social
@pawpower @Fragglemuppet @matt @adhdeanasl @WittiePenguin @RareBird15 IOS has the VoiceOver screen reader, already. There are many Mastodon clients that work well with it. I'm using Mona. IceCubes is another good choice. For Linux distros, the Orca screen reader is already included, and works well with firefox, thunderbird, the core utilities, and libreoffice, which is also included. I've used the Tuba Linux Mastodon client, with orca, but it's difficult.
@matt @adhdeanasl @wx1g @RareBird15 @pawpower Yep, I use Windows and NVDA, and don't have a problem. Does Tweesecake work with Linux? It's a Mastodon client that might also be helpful.
@matt @Fragglemuppet @adhdeanasl @RareBird15 @pawpower So far, the only desktop Mastodon app, I know, is Tuba. Best bet is to use your instance web site with firefox. There's an alternative web front end called enafore, which I am using to make this post.
@afewbugs I’ve found Mastodon really easy to use with a screen reader, and apps like Mona make scrolling the timelines and interacting even easier. I don’t know about resources as such, so I’ll boost, but just wanted to put in my 2 pennies too.
Edit: Just had a look and, of course, @FediTips has something on it: fedi.tips/how-do-i-use-mastodo…
Edit: Just had a look and, of course, @FediTips has something on it: fedi.tips/how-do-i-use-mastodo…
How do I use Mastodon through a screen reader? | Fedi.Tips – An Unofficial Guide to Mastodon and the Fediverse
An unofficial guide to using Mastodon and the Fediversefedi.tips
This entry was edited (Sunday, January 11, 2026, 2:24 PM)
You might wish to include the hastag: #BlindMastodon
hi. Marco is using assistive accessibility tech, but maybe just VoiceOver on iOS? @marcozehe 😀
@freddy Most of us blind people use Mona on iOS and iPadOS and MacOS. On Windows, there's TweeseCake. After registering with a Mastodon instance, and doing a rudimentary setup in the Mastodon settings, one can use the 3rd party client without needing to use the Mastodon web interface.
@mousebot
I wonder if an add on for mastodon.el could make that easier. Ive never tried the reader in emacs, but have always heard good things.
I wonder if an add on for mastodon.el could make that easier. Ive never tried the reader in emacs, but have always heard good things.
This may be one for @FediTips
Adding the #Blind hashtag might improve your chances.
Can't help you with the software question, but there is a cosy instance run by visually impaired people: dragonscave.space/about – might make a nicer starting point than one of the larger generic ones.
twblue and tweesecake are apps made specifically for screen reader users on windows... mona on ios... and tusky on android...
Ping @JonathanMosen
Jonathan: @me
is asking about Mastodon clients and screen readers in the toot above.
@zl2tod Looks like some good replies are coming in on this thread already. In my view, Mastodon is the most accessible social media platform around.
I would add a couple of things.
First, any blind person is very welcome to join us here at CaneAndAble.social, a great community for blind Mastodon users. There are plenty of helpful people here.
Second, if the person uses iOS, I produced an audio tutorial on Mona for Mastodon. This went out as part of the Living Blindfully podcast I used to run, which can still be found in any podcast app.
Mona has been updated since then, but it’s still very relevant, and many blind people appreciate an audio walkthrough.
The URL for the audio is: LivingBlindfully.com/227, and the transcript is at LivingBlindfully.com/lb0227tra…
I would add a couple of things.
First, any blind person is very welcome to join us here at CaneAndAble.social, a great community for blind Mastodon users. There are plenty of helpful people here.
Second, if the person uses iOS, I produced an audio tutorial on Mona for Mastodon. This went out as part of the Living Blindfully podcast I used to run, which can still be found in any podcast app.
Mona has been updated since then, but it’s still very relevant, and many blind people appreciate an audio walkthrough.
The URL for the audio is: LivingBlindfully.com/227, and the transcript is at LivingBlindfully.com/lb0227tra…
Episode 227:A tutorial on Mona for Mastodon, the most powerful, accessible way to do Mastodon on your iPhone, iPad and Mac
This special episode is devoted to Mona, a Mastodon app for iOS, iPadOS and MacOS. It has exceptional VoiceOver accessibility, and during its development, the developer has consulted extensively with the blind community.Living Blindfully
a partner uses enafore.social/ with a screenreader occasionally, but i don't remember if it is good or just passable 
might be worth a try
Home · Enafore
A fediverse client with better support for Akkoma, glitch-soc, and Iceshrimp instances.enafore.social
I think @WeirdWriter would be a good expert on this? He's written a Fediverse guide for blind people at sightlessscribbles.com/posts/5…
Fediverse for writers/readers., Sightless Scribbles
A fabulously gay blind author.sightlessscribbles.com
Jonathan Lamothe likes this.
Maybe @kc can help
@ePD5qRxX imo there's no way around third party clients at the moment. I'm using iOS/macOS-based devices only right now, and the Mona 6/Mona Classic client from the app store work rather nicely. I've also had good experience with Tusky on Android a couple of years ago and I hear its still great.
You might want to add the #accesibility tag for more reach. Good luck!
I've tried using some of the fedi web apps with a screen reader and yeah they tend to be horrible
There may be some native apps that do better in that regard
my friend @freya@chaosfem.tw uses a screen reader. Freya, do you have any advice on this?
@sodiboo it works perfectly well with screenreaders if you use the right client. Inafore is cross-platform and Tweesecake works well on windows
@cassana Tweesecake on Windows, Mona on Mac, also iOS. Sorry, they're on their own for Android. These are the ones I've used, there might be others.
Web clients should also work though, I think.
I am not blind, so I cannot judge the validity of the articles/tips linked, but this page has some tips: fedi.tips/how-do-i-use-mastodo…
How do I use Mastodon through a screen reader? | Fedi.Tips – An Unofficial Guide to Mastodon and the Fediverse
An unofficial guide to using Mastodon and the Fediversefedi.tips
I’m sighted and won’t comment! But I will tag @MonaApp as so many folks in the thread have mentioned the app. (And I’ll add that it’s great for sighted people too!)
While I was blind (long story, medical mishap) I found PCs and laptops to be bloody useless. What did work well was a large Android phone or tablet running "Talkback" and an accessibility one-handed keyboard called a Quirkey (which as a dev I knew how to use). Touching the screen gave a good mental map of layout, and the Quirkey removed the need for an on-screen keyboard. I just used Fedilab as I knew the layout already.
This entry was edited (Sunday, January 11, 2026, 8:25 PM)
@elettrona I turned on slow mode in the web interface (it's in Settings → Preferences → Appearance), because without it the focus kept changing.
hey @Clio09, @Brailly615 , any tipps from your end?
@C3nC3 @Brailly615
@MonaApp for #IOS and @pachli for #Android are 2 great #Accessible Mastodon clients.
@MonaApp for #IOS and @pachli for #Android are 2 great #Accessible Mastodon clients.
@Brailly615 In another comment it has been said that its about Linux, there I unfortunately can't help. I use Webclients, unfortunately they don't get any Updates anymore or I'd have recommended something. I only use them because I haven't found something better yet that I don't need to install. @Clio09 @C3nC3 @me @MonaApp @pachli
@svenja @Brailly615 @Clio09 @C3nC3 @MonaApp If it is about Linux, I can't help either. In Windows there is #Tweesecake. Although it seems that it is not updated anymore, we can work fairly well with it.
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ed(1) conference
in reply to Jonathan Lamothe • • •For just capturing the output of a command, you can use:
r !somecommandBut if you want to filter a range of lines through an external filter with POSIX
ed(1), you need some sort of temporary storage (whether a file, the system clipboard, atmuxbuffer or whatever). There's no analog to:10,20! rot13offered by
vi/vim.Someone (can't find the post/author at the moment) did hack this functionality into
ed, but it's a custom fork of POSIX functionality.Jonathan Lamothe likes this.
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Jonathan Lamothe
in reply to ed(1) conference • •ed(1) conference
in reply to Jonathan Lamothe • • •Using temporary/transient storage can avoid the temp-file cleanup step though:
or
Ameliorates it by a wee bit, but still a hassle that I'd fix if I had a time machine
Jonathan Lamothe
in reply to ed(1) conference • •ed(1) conference
in reply to Jonathan Lamothe • • •xclipinstead (similar functionality on X),pbcopy/pbpasteon OSX, or some similar tool on Wayland or Windows.bun microsystems likes this.
SirWumpus 🍁🎃 ⚔️
in reply to Jonathan Lamothe • • •ednot that I know. Withex/vi/ehyes. They have pipe through command some region of the buffer or all of it, eg.!{fmt -w68Harka
in reply to Jonathan Lamothe • • •Jonathan Lamothe
in reply to Harka • •!command. The contents of the buffer can either be piped into the command or piped out of it, but not both.Jonathan Lamothe
Unknown parent • •Norman Wilson
in reply to Jonathan Lamothe • • •Toronto qed (descended from ed in the late 1970s, not the 1960s editor that inspired ed) has three commands for exchanging text with other programs:
>command # send to command's standard input
<command # receive from standard output
|command # send to stdin, read from stdout, replacing original addressed lines
Of course > and | take an address range and < a single address, like w and r.
I use | quite often either in ed or in sam; latter written by the guy from whom I caught the qed bug.
Implementing | takes some thought to avoid deadlock if pipes fill and block. Qed does it by spawing a temporary process to do the writing, while the main process reads into the buffer.
Jonathan Lamothe likes this.
Norman Wilson
in reply to Jonathan Lamothe • • •@ed1conf @buffet Sam runs just fine on Linux; I use it there daily (alongside Toronto qed). I think it has been ported to OpenBSD, FreeBSD, and even Windows.
It amuses me that people associate it only with Plan 9; it was originally written for ~9th edition Research Unix, before the Plan 9 project started. (I was there, and an early adopter.)
Jonathan Lamothe likes this.
Harka
in reply to Jonathan Lamothe • • •Jonathan Lamothe
in reply to Harka • •