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- Apprentice mathematician (Professor at Université Paris Cité),
interested in algebraic geometry, number theory and (more recently) proof formalization
- Apprentice musician (drums, tabla, cajon; previously Diderock; a rarely meeting jazz trio/quartet).
- Apprentice progressist.

In love with math, jazz, indian music and poetry. ⏚

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Professor of Federated Search at Radboud University. Formerly known as @hiemstra @ https://mastodon.utwente.nl: https://web.archive.org/web/20220701235108/https://mastodon.utwente.nl/@hiemstra

","updated":"2025-07-22 01:46:40.815Z","user":"","username":"Djoerd Hiemstra 🍉"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-11 20:19:54.296Z","domain":"mathstodon.xyz","followerCount":96,"followers":"https://mathstodon.xyz/users/m4rk1x/followers","following":"https://mathstodon.xyz/users/m4rk1x/following","followingCount":58,"icon":"https://media.mathstodon.xyz/accounts/avatars/110/497/029/518/714/784/original/a17b4b9905f12388.jpeg","id":"7cssc683czb86qi","inbox":"https://mathstodon.xyz/users/m4rk1x/inbox","iri":"https://mathstodon.xyz/users/m4rk1x","isLocal":false,"last_fetched":"2025-07-22 02:12:02.264Z","outbox":"https://mathstodon.xyz/users/m4rk1x/outbox","preferred_username":"m4rk1x","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx6GNwpBW9dWPq0xgDIuc\nBKvejU3hI8H8Yy0ebgJjkodBwzXcqR9HSl99z/ON0WR0usdDd5uWiMwlD0Ay1xnt\nYhKwWi6uKlJvFb2NzzgzFnqC/V7OoT4SdQJwtOFPmf7uFfq25a0NqCLCz/uA1WY1\nHKZBRpNMxzkRSHn4q6LkyaaoKkL9OjXmQ2c7XSAD8/1ba2GjDK9KXw9xb7p24jE3\nkt4oVZLntqKTawUaAammLMLsraIgL8PFuK17eiGtAxU0WMX6HFQY0ryQqkDYUBC/\nyZvgz8P+1de7oT665veqACoJ+cditAKzNkM7PjaEdP0Q6uacmCy0YPMzCu7Mmzuq\nNwIDAQAB\n-----END PUBLIC KEY-----\n","published":"2023-06-06 00:00:00.000Z","summary":"

Category Theory, Semantics and Type Theory.

","updated":"2025-07-22 02:12:02.264Z","user":"","username":"Marco Paviotti"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-22 02:12:02.447Z","domain":"lipn.info","followerCount":0,"followers":"https://lipn.info/users/clementaubert/followers","following":"https://lipn.info/users/clementaubert/following","followingCount":0,"icon":"https://lipn.info/system/accounts/avatars/109/264/869/230/698/037/original/2420d21641d42db7.jpg","id":"414ricwcg50u13t","inbox":"https://lipn.info/users/clementaubert/inbox","iri":"https://lipn.info/users/clementaubert","isLocal":false,"last_fetched":"2025-07-22 02:12:02.446Z","outbox":"https://lipn.info/users/clementaubert/outbox","preferred_username":"clementaubert","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA36YvjIbN3Su7WhTOLUeU\nsbBiefh+92zfUud7OQT184lXckznhFuZlvwysbpGfSW0l5C2UtoVnajruaO00Jro\ne6CwP3U3n3Lo9KTnBRpOc4c1/OpC0qqeh1bBoKuMYzatOxkGpcHIOZYVFGTH+5CM\njqVZj5MGna6nW90lHPi5phiWMtWGZEL+cBJFoeRsIVAEwzDyU/zhoVeo3TbY8/ZI\nusFVXGEd6M66VDPkv/PTVTXYuRbNap0x4MaEReNKyS0wGZ5rLPqbZjnAoCGxvdob\n4gr1DZs9OtRCI7NiIn2zHGKXFFk4OWHwQxHk8lvyJ13PhQdek0yE3QVIr9PWCPAo\nrQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-10-31 00:00:00.000Z","summary":"

🇺🇸 Associate Prof. in Computer Sciences at Augusta University (GA, USA)
---
🇫🇷 Enseignant-chercheur en Informatique à l’Université d’Augusta (États-Unis d’Amériques)

","updated":"2025-07-22 02:12:02.447Z","user":"","username":"Clément Aubert"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-07 04:43:41.642Z","domain":"idf.social","followerCount":877,"followers":"https://idf.social/users/arjen/followers","following":"https://idf.social/users/arjen/following","followingCount":1206,"icon":"https://idf.social/system/accounts/avatars/000/000/001/original/e18614dcbe618f58.jpg","id":"9yp972807gt132d","inbox":"https://idf.social/users/arjen/inbox","iri":"https://idf.social/users/arjen","isLocal":false,"last_fetched":"2025-07-22 02:12:02.600Z","outbox":"https://idf.social/users/arjen/outbox","preferred_username":"arjen","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuOwobP4ARCledL7PXrLF\nkIZfx6bzTyTGeG7fBP2s5TE6vWrhR47XjfmFJLb+GVE773loDuKAbnmacHLT6NHs\nXuPLDc8P5PINEuJgb6o+HOyibauoVvt66OQyVZBN6/0N/X34l5Axbla5yJ9Cp4nf\npdTYIrnJbxWBNIaseadYDpNU+Ya7NkfCPkH1+POgheuDNapbJeO5qJdPeTb+98x6\nRjS89Jey9mE3ObRt+NGtNdRAXwyRaYY5Pys4dWqJowqydAJAM+HrhCfDT2jcp2qD\neuIRKPufvnHZKNaK7HZ1DDzA6R/oCAp1nCNkPbklxJIzH7n01GPBpLPumeOkyQQq\nAQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2018-04-17 00:00:00.000Z","summary":"

Computer scientist #CS & entrepeneur, Information Retrieval #IR and Databases #DB

Indie music 🎸

Radboud University, Nijmegen & Spinque, Utrecht NL
#nobot

","updated":"2025-07-22 02:12:02.601Z","user":"","username":"Arjen P. de Vries Timmers 🕊️"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-21 16:22:12.663Z","domain":"mathstodon.xyz","followerCount":0,"followers":"https://mathstodon.xyz/users/ssteakley/followers","following":"https://mathstodon.xyz/users/ssteakley/following","followingCount":0,"icon":"https://media.mathstodon.xyz/accounts/avatars/109/265/990/012/758/673/original/38bbbb4db96d8943.jpg","id":"9a17t5lx45pg91i","inbox":"https://mathstodon.xyz/users/ssteakley/inbox","iri":"https://mathstodon.xyz/users/ssteakley","isLocal":false,"last_fetched":"2025-07-22 02:12:02.742Z","outbox":"https://mathstodon.xyz/users/ssteakley/outbox","preferred_username":"ssteakley","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvXo833LZ4q4yhdes8ZTg\n1CF7VGp79W9BNkoJcdnzggAPFfFPufmUL8tO3K2C25Vn77aAlfPYxUlxIb1tTSIE\njc4jMO/lLs01lkBAKdun1j4fby6oGEHDrp2LzzCWBVKZneEXbzo8FczxnD7fKCqG\ngttkovkBRZ2phEXjUmtfdvdVI6ImeADVb9Z/398RMhvIUaEx3xWah7JhiotDoHuM\nF0HTYX4b04z9M2gd2UiaZqFEOhoWZusCnxmOmPNF7wjNK0HCEH5aniILUt/dnXon\nfMrE4+edGY2vHAFplDPe7z1qChbAbixE9zzso4ub/3Kka/V9bMBm5vhuK6fO6VpQ\nSwIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-11-01 00:00:00.000Z","summary":"

UCalgary mathematics

","updated":"2025-07-22 02:12:02.742Z","user":"","username":"Samuel Steakley"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-20 20:27:14.970Z","domain":"mathstodon.xyz","followerCount":0,"followers":"https://mathstodon.xyz/users/mabeltree/followers","following":"https://mathstodon.xyz/users/mabeltree/following","followingCount":0,"icon":"https://media.mathstodon.xyz/accounts/avatars/110/284/246/961/454/467/original/88c8f099f6a27868.jpg","id":"u647hjvt15padut","inbox":"https://mathstodon.xyz/users/mabeltree/inbox","iri":"https://mathstodon.xyz/users/mabeltree","isLocal":false,"last_fetched":"2025-07-22 02:12:02.777Z","outbox":"https://mathstodon.xyz/users/mabeltree/outbox","preferred_username":"mabeltree","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt4FauN/sOGRXCyxbWVew\nKLACSQVGVr96J0QXlJLV67hHE+ZCJ3pm5zBjZfiBBDLdgzYcjSxGemGDFlyDud17\noYt7h4kw/0ipuXEvR5L1Ll6M5EJzy0vPLZLeWytpek+RjbvBVC3sG6Zu+SsMq0fk\n37ZMtzPhwof6WtaztT2ZhTR3ZsWAf2u1WGvn7u398ZtU/qXAzR6ERxwNtpRhwmkq\nqaV/zuXHR/0N53zV+U/ERoOQypBVPeIpNshq3/ICxsE7ykVP+xZLCCrEW8K3Bh3B\nM/vLQqc36uITsyBB/I8I/Mt+pXRkaWGrMKlcrhmSDBFYzasNA3Gc84sBij1VYSbw\n+QIDAQAB\n-----END PUBLIC KEY-----\n","published":"2023-04-29 00:00:00.000Z","summary":"","updated":"2025-07-22 02:12:02.777Z","user":"","username":"Mabel Najdovski"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-22 02:12:02.816Z","domain":"mathstodon.xyz","followerCount":0,"followers":"https://mathstodon.xyz/users/paolop/followers","following":"https://mathstodon.xyz/users/paolop/following","followingCount":0,"icon":"https://media.mathstodon.xyz/accounts/avatars/000/289/554/original/b56da81fbaf3bbb2.jpg","id":"814t141255pv5zc","inbox":"https://mathstodon.xyz/users/paolop/inbox","iri":"https://mathstodon.xyz/users/paolop","isLocal":false,"last_fetched":"2025-07-22 02:12:02.814Z","outbox":"https://mathstodon.xyz/users/paolop/outbox","preferred_username":"paolop","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5MyJjDtiiYyEco7GPcRk\neE6oiwSqmtJlGQ8haNOL8xiQ6uMVt4mSfiuCQeDwHeaFuFq4dvVqk15wQxjQRM7T\nd9VCiFUxC7gztLkhwxWAqSm4ZYNBVYTObxLj6Wg8lpXD35suGf/NM066Mm8gwArR\nHv05Jxhvhw5P4n+VBfMEfhuKFtGjK2fin+PKsIR0gsS9TX0bt6jdDT7k8UDIpMh+\ngfQbhkOoPTns4sBM72tmKZYzKjbmE9kutGMJ25xBxkjfOQuPKhNQPCPFQE9/p8MZ\nR9+M+WyKpVqguGJwbX7ELJZG1Tn7zuu2mRh4PdeN16SA/bzZiWDeoHC3oGvSx71E\nbwIDAQAB\n-----END PUBLIC KEY-----\n","published":"2022-04-26 00:00:00.000Z","summary":"

Mathematician & math teacher
University of Oxford

","updated":"2025-07-22 02:12:02.816Z","user":"","username":"Paolo Perrone"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-22 02:12:02.854Z","domain":"mathstodon.xyz","followerCount":0,"followers":"https://mathstodon.xyz/users/todd/followers","following":"https://mathstodon.xyz/users/todd/following","followingCount":0,"icon":"https://media.mathstodon.xyz/accounts/avatars/110/989/227/414/998/466/original/63ce774b7b51d16a.jpg","id":"j1u13i6pjy1u9zs","inbox":"https://mathstodon.xyz/users/todd/inbox","iri":"https://mathstodon.xyz/users/todd","isLocal":false,"last_fetched":"2025-07-22 02:12:02.853Z","outbox":"https://mathstodon.xyz/users/todd/outbox","preferred_username":"todd","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAx/Ch4U2108rlXGZefljc\nVoPynUiMlGUo4/qAhq+mNlshXfPlcpie1u2DgSsGfWhMSycJCscvxv2h2o6IAu6R\nNqcp8a7bQVoJxIIgDoYpnNi/suMssRubfd6asd5nI4qqodeVlFaAHvK/OAldnbJh\nhx5qHAgOQwYqgj50x6IMhT1lngLCEdxbjGYncBOSJ9CLfYZgsvv7f0VINkXD0Ox7\nPW4BBcYotNZ3xKdIkPE5J1p7Ol+AsKN8igR1deZr2pyXD4gBAEnut8fTOcopNJ5a\nLO7MrGW/s+oT9T3AYk7yfrt37bMQb18ux4LNCTwpGAuFsFbqCRWZuWjfpTOdMWPy\nPQIDAQAB\n-----END PUBLIC KEY-----\n","published":"2023-09-01 00:00:00.000Z","summary":"

Theory & Teaching @ University of Birmingham -- Interests include Agda and Type Theory

","updated":"2025-07-22 02:12:02.854Z","user":"","username":"Todd Waugh Ambridge"},{"collectionId":"pbc_1295301207","collectionName":"activitypub_actors","created":"2025-07-10 05:01:35.987Z","domain":"mathstodon.xyz","followerCount":275,"followers":"https://mathstodon.xyz/users/hartkp/followers","following":"https://mathstodon.xyz/users/hartkp/following","followingCount":191,"icon":"https://media.mathstodon.xyz/accounts/avatars/000/092/370/original/4b3d28e158118483.jpg","id":"bq4qs2450w12zpm","inbox":"https://mathstodon.xyz/users/hartkp/inbox","iri":"https://mathstodon.xyz/users/hartkp","isLocal":false,"last_fetched":"2025-07-22 02:12:02.891Z","outbox":"https://mathstodon.xyz/users/hartkp/outbox","preferred_username":"hartkp","public_key":"-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA38QosttXdAvM0GPsv7Py\nG2qTWzB/79MAfBK1Fza5xxGdueAC31bnV0IOWEibroazwI4+dJH+CHbuZs8XlThb\n2zO5nfaiW5QM422Xd5StkNxNbTp3bXyb9zBEVTu/BmjBruIGu4LRhvXREwDTJ8j5\nktpPMJnwxUVx4H9nfsATfsVvmQKA01lC+t9y2LI3UVm2nv72qWRslW2auVzFYcwE\nn5RoXQaoFtfAlRJcHboIAvQwWo/cFjfZYJeAelLdVDgALiS3GzBJrL7G4T92G9J/\n9ILSVDh2iEPU4eq7jmYFQOo4ChQ95snPtqNqnH856L2BJzm1s1iz4ajdMxON00mK\n+wIDAQAB\n-----END PUBLIC KEY-----\n","published":"2019-06-06 00:00:00.000Z","summary":"

Eg e' matematiker/I'm a mathematician.
Also: mathsplainer

","updated":"2025-07-22 02:12:02.892Z","user":"","username":"K. P. Hart"}],"page":1,"perPage":10,"totalItems":49,"totalPages":5}

Niels van der Weide

Following