Show more

A variant of the classic 15-puzzle, where the puzzle is coiled around a cylinder. Unlike the original, this version is solvable because of the extra connection between the first and sixteenth squares of the frame. YouTube:

An enjoyable problem (104.B) from the latest Mathematical Gazette: A regular 7-gon is inscribed in the unit circle, with one vertex at (1,0). Find the equations of the two parabolas, symmetric across the x-axis, which pass through the vertices of the heptagon as shown.

(こちらからは一向にフォロリク通らない 、そちらでフォロー中の31万トゥート(プレロマGSではnoticeだっけか)フォロー解除で全く見えなくなって、そんなこともあるんだなあと。あと のページネーションの識別子長すぎかよ

mathstodon,xyz is now running Mastodon v3.1.2.
I think the vast majority of changes are server-side.
See the release notes at

All of 's services have recently been upgraded to their latest versions. Let us know if you see any problems. Below is the full list of effected services.

NextCloud -

GitLab -

GitLab pages (including user hosted pages) - https://*

FunkWhale -

PeerTube -

Discourse -

Hi Fediverse 👋

a Happy Valentine's Day to all of you! 🙂

Sending out our love to all the admins, artists, bloggers, coders, designers, donators, moderators, promoters, translators, writers and further contributors to Free and Open Source Software and/or Copyleft Content - you are amazing ❤

Whose project, work or contribution did you enjoy the most recently? Let them know you care 🙂

For me, these are @fsfe for inspiring and @inkscape for enabling me to create this image 🖼


First post 

😂 the picture is of a pair of ballet shoes


First post 

#deletefacebook and get on #mastodon 

or setup your own mastodon servers own your data...

I've been using the chrome google translate extension for a few weeks now to translate foreign language posts in my feed. It has done an amazing job virtually every post seems to translate and the translation seems well enough to communicate and get the original intent.

How is this not a built-in mastodon feature!

@porsupah It would be nice if there was a comparison between the main line and the fork. I want to see it too.

The link for Mastodon Fork is here.

I am the author of one of the Mastodon Forks, Fedibird.

@japan をPlumeコメントでは使おうと思ってた(どうせ初手プレロマ(のCW空白もCWで認識されてたPlume)以外ではリプライツリー内での@メンションが必要ということから)のに完全に忘れてた謎現象報告のターン。やっぱプレロマにもマストドンBLOCKはキツいっすわ謎の備忘録 @wasanpuzzl

@wasanpuzzl ってことは画像付き記事だけ限定での発動じゃないかな、バナー設定か添付の方かとかは試してみないと分からない予定未定

#FOSDEM happened! We just published a quick wrap-up of the conference and videos of all the talks :D Thanks once again to everyone who came to our talks and spoke to us :)

Show more
Qoto Mastodon

QOTO: Question Others to Teach Ourselves. A STEM-oriented instance.

An inclusive free speech instance.
All cultures and opinions welcome.
Explicit hate speech and harassment strictly forbidden.
We federate with all servers: we don't block any servers.