YouTube videos on proportional approval methods

I found a couple of YouTube videos with Markus Brill talking about proportional approval methods.
The first one is a bit more wide ranging in what it talks about. Among other things it talks about Extended Justified Representation (EJR) and Thiele's Proportional Approval Voting (PAV).
The second one is about the Minimax Support Method, which is the same as sequential maxPhragmén. Although maxPhragmén isn't properly defined on that wiki page, and it doesn't explain that the loads can be spread unevenly across the voters.
Edit  I've made an edit to the Phragmén wiki page to make it more accurate. I'm not sure everything else on there is exactly right though.
Edit 2  I've changed the topic title to make it about general videos on the subject

@tobypereira said in A couple of talks by Markus Brill on proportional approval methods:
Minimax Support Method, which is the same as sequential maxPhragmén
They are similar but not the same. Maximin Support Method actually provides a polynomial approximation to maxPhragmen. SeqPhragmen does not.

@andydienes said in A couple of talks by Markus Brill on proportional approval methods:
@tobypereira said in A couple of talks by Markus Brill on proportional approval methods:
Minimax Support Method, which is the same as sequential maxPhragmén
They are similar but not the same. Maximin Support Method actually provides a polynomial approximation to maxPhragmen. SeqPhragmen does not.
I would distinguish between seqPhragmén (which is Phragmén's own method) and sequential maxPhragmén, which is the sequential best approximation of maxPhragmén.

By the way, Ross Hyman reinvented maxPhragmén in this post from 2011 on the EM mailing list. Although it's defined in a different way, they appear to be equivalent.

Here is one by Piotr Skowron as well titled "Consistent ApprovalBased MultiWinner Rules".
And here's one called "Proportionality and the Limits of Welfarism" (comparing Phragmén and Thiele). I didn't actually catch the guy's name. It didn't sound like the names in the paper  Dominik Peters or Piotr Skowron (and it doesn't look like Piotr Skowron)  and the subtitles have it as Scott Anand, which is a name I'm not familiar with.