Andreas Kloeckner<p>Ever wondered whether fast direct solvers are compatible with Quadrature by Expansion, a method for the evaluation of singular layer potentials? Wonder no more 🙂 In <a href="https://arxiv.org/abs/2504.13809" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arxiv.org/abs/2504.13809</span><span class="invisible"></span></a>, we offer an algorithmic recipe, analysis, an end-to-end error model, and some weighting tricks, the latter two applicable beyond QBX, along with numerical experiments. <a href="https://mastodon.social/tags/layerpot" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>layerpot</span></a> <a href="https://mastodon.social/tags/fastalg" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>fastalg</span></a> <a href="https://mastodon.social/tags/fastalgorithm" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>fastalgorithm</span></a> <a href="https://mastodon.social/tags/numpde" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>numpde</span></a> <a href="https://mastodon.social/tags/numerics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>numerics</span></a> <a href="https://mastodon.social/tags/scicomp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>scicomp</span></a> <a href="https://mastodon.social/tags/paper" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>paper</span></a> 🎓 📖</p>