2026-10-18T14:06:27Z https://yabu.me Carlo Angiuli https://yabu.me/npub1q5nf9vpml4ddnxx7qe3cjw9aywweaemkek6fu8wag8kuwfe8pqps2a5nnq https://media.mathstodon.xyz/accounts/avatars/113/283/570/352/770/474/original/d98c2d8c0c85c0ac.jpg https://media.mathstodon.xyz/accounts/avatars/113/283/570/352/770/474/original/d98c2d8c0c85c0ac.jpg https://yabu.me/nevent1qqsvkwymxwvaqs6mvwwx7vdwj8x0vkv62wue3p7dulq7s6qy3ewn66qzyqzjdy4s80744kvcmcrx8zfch53em8h8wmxmf8sam4q7m3e8yuyqxacfgvl <span itemprop="mentions" itemscope itemtype="https://schema.org/Person"><a itemprop="url" href="/npub1zwlhl84xnlyyzkpqrk6yg782jz9e3v37kznxpjpe0jexjq8kq7vqq3df7y" class="bg-lavender dark:prose:text-neutral-50 dark:text-neutral-50 dark:bg-garnet px-1"><span>daniel gratzer</span> (<span class="italic">npub1zwl…df7y</span>)</a></span> and I have just released a new version of _Principles of Dependent Type Theory_! This one is a significant milestone: all planned content has been drafted; we do not expect any new sections at this point.<br/><br/>Main changes:<br/>- Added Appendix B on generalized algebraic theories! This resolves some unfinished business from earlier in the book, by proving the &#34;initiality theorem&#34; for ETT/ITT.<br/>- Added a draft of Section 4.4 on observational type theory.<br/>- Removed &#34;solutions to selected exercises&#34;, and converted the most important handful of exercises into lemmas with proofs.<br/>- Various improvements to Chapter 6 (categorical semantics).<br/>- Expanded Section 3.6 on undecidability of equality in ETT, including a series of exercises establishing the undecidability of equality in TT with judgmental Nat-eta.<br/><br/><a href="https://www.carloangiuli.com/papers/type-theory-book.pdf">https://www.carloangiuli.com/papers/type-theory-book.pdf</a> 2026-09-22T19:23:38Z https://yabu.me/nevent1qqspz2gprfr999w60kwha5w30se0wjqc5376cmfrkpfe5m07t3rq94qzyqzjdy4s80744kvcmcrx8zfch53em8h8wmxmf8sam4q7m3e8yuyqxqkkea2 Very interesting experiment by Nihar B. Shah, who contacted authors of ten Transactions on Machine Learning Research (TMLR) submissions slated for desk rejection, and asked them to explain their submission over Zoom.<br/><br/>One frightening statistic from the article: &#34;The fraction of desk rejected papers at TMLR used to be about 6% in 2023 but is now at about 53%.&#34;<br/><br/><a href="https://medium.com/@TmlrOrg/asking-authors-about-their-own-papers-3d2e04e5dee0">https://medium.com/@TmlrOrg/asking-authors-about-their-own-papers-3d2e04e5dee0</a> 2026-09-18T14:02:48Z https://yabu.me/nevent1qqsqdwj3uzxw7tzqmkgw6ycgttm9rxlpmltvuxmy9kgz9lz5snxav3szyqzjdy4s80744kvcmcrx8zfch53em8h8wmxmf8sam4q7m3e8yuyqxlejqqs I hope arXiv will finally be able to make some needed quality-of-life improvements. Maybe they could add a few extra clicks to open any paper, or some banners with their CEO&#39;s name?<br/> <img src="https://media.mathstodon.xyz/media_attachments/files/116/848/120/647/575/153/original/887754051ca0cf4f.png"> <br/> 2026-07-02T03:00:39Z https://yabu.me/nevent1qqst98pfmnjrqkvm5httvcqutfndxx9kdgj9z88pv8atxm62m8vm3cgzyqzjdy4s80744kvcmcrx8zfch53em8h8wmxmf8sam4q7m3e8yuyqx0rjfv8 In reply to <a href='/nevent1qqsv6j3fejkhxnxpf2mdp3pue4utm88eyz5sja9nypsrwyr7xp9cnfg4pruhq'>nevent1q…ruhq</a><br/>_________________________<br/><br/>Well, I assume they mean that Matthew Wilcox invented the name &#34;sheaf&#34; for a per-CPU cache of pre-allocated memory objects, not that he invented the word &#34;sheaf&#34; itself... 2025-09-15T16:07:29Z https://yabu.me/nevent1qqsw3h3k3rshc3hgkqxt7mf5jqmxndy0hl2xqqm0n74h6h7pv3x389gzyqzjdy4s80744kvcmcrx8zfch53em8h8wmxmf8sam4q7m3e8yuyqxzt9p36 Sheaves in Geometry and Linux <a href="https://www.phoronix.com/news/Linux-6.18-Likely-Sheaves">https://www.phoronix.com/news/Linux-6.18-Likely-Sheaves</a> 2025-09-15T02:45:37Z https://yabu.me/nevent1qqsx98824md85h5g8s0hsl54c8xjszhh3k4ewhhpxca8sc6qjc8mvfgzyqzjdy4s80744kvcmcrx8zfch53em8h8wmxmf8sam4q7m3e8yuyqxqh9lep Do you love and/or hate HoTT or dependent type theory? Come do a Ph.D. with me to develop applications of HoTT to verified functional programming and/or think outside the box about how we can make dependent type theory work better.<br/><br/>I recently received a grant to study the Univalent Verification of Parameterized Structures, and I need Ph.D. students to spend that money on. Application deadline December 15 to start Fall 2025. Lots more info here: <a href="https://www.carloangiuli.com/pages/phd-recruiting-2024.html">https://www.carloangiuli.com/pages/phd-recruiting-2024.html</a> 2024-10-23T19:53:43Z