© | Dror Bar-Natan: Academic Pensieve: | Random |
Recent prefixes: LiuJ Afeke KAL PoleDancing VanDerVeen Frohlich Halacheva 2122-257 Gupta Abbasi TangYC Dror Gaudreau Scherich Munasinghe Meusburger
All prefixes: 08401 09240 10_327 11_1100 12_240 12_267 14_1100 15-344 15-475 16-1750 16-475 1617-257 17-1750 18-327 18S-AKT 2122-257 AKT09 AKT14 AKT17 Aarhus Abbasi Accra2010 Afeke Alekseev Alexakis Alhawaj Andersen Antolin Archibald BCHKW Bazett Beliakova Bellingeri Bettencourt Bigelow Blazejewski Boden Brin Brochier BrownF Bryden Burgos Caen Carrasco Carter Cattaneo Cheng Chterental Chu Cimasoni Conant Costantino Costello Dalvit Dancso Dema Deng Dolgushev Dror Enriquez Ens Etingof Faifman Fiedler Filmus Freedman Fresse Frohlich Frohman Furusho Gadanidis Gallagher Gaudreau Getzler Godin Gualtieri Gupta Halacheva Henriques Hillman Hirasawa Hoell Humbert Hurd Itai Izmaylov JohnsonFreyd KAL Kalka Kamnitzer Karshon Kashaev Katz Kauffman Kazhdan KhesinA Khovanov Kirk Koytcheff Kricker Kuno Kuperberg Lai Lambrechts LazyKnots Le LeD Ledvinka LeeP Leung LiBland LicataT LiuJ Martel Martins Masbaum Massuyeau Matviichuk McKay McLellan Medabalimi Meusburger Mirny MorganS Morrison Morton-Ferguson Moskovich Mracek Munasinghe Naef Nandakumar Nikolaev Olah Orr Overbay Papakonstantinou Peng Penneys PoleDancing PolyPoly-1605 Polyak Putyra Ramakrishna Rasmussen Raynor Reed Remenik Reshetikhin RobertsonM Roukema Rushworth Samuelson Sazdanovic Schaveling Scherich Schneps Sela Selmani Severa Smirnov Spreer Stein Sternberg SummerHomology2017 TangYC Thimotheus ThurstonD ToledanoLaredo Tsimerman VanDerVeen Vaughan Vergne VideoClub Vo WangH Willwacher Winter Yampolsky Yetter ZeilbergerN Zhang Zibrowius Zung deSilva wClips
Date-Time / Prefix | Comment |
What? A collection of Blackboard Shots (7229, right now, with 185 prefixes), mostly taken
in my office using a ceiling-mounted web camera.
Why? Mostly for my own use and for the use of the other people with whom I share blackboard space. And it is public because the easiest way to make something viewable to a number of people is to make it viewable to the whole world. Oh no! If you found your handwriting here and you don't like it, please let me know and the relevant shot(s) will be removed, no questions asked. How? A ceiling-mounted Logitech QuickCam Pro 9000 web camera is permanently pointed at my blackboard and connected via USB to this web server. The script bbs.php initiates a capture (using luvcview; hit "s" to shoot and "q" to quit), prompts for a file name prefix and a comment, and runs make. The makefile runs MakeDatabase.php (if necessary) to update the ShotDatabase.php. The latter file is used by index.php, which is this page, and also by show.php, used to display individual shots. The makefile also updates bbs.zip, which contains all the above mentioned scripts as well as common.php, showprefix.php, loadnew.php, random.php, the JavaScript actions.js, and the icon bbs.jpg. Finally, $\TeX$-like rendering uses MathJax (automatic on all pages but this one). Exceptions. Some shots are taken by other means and are added manually or using loadnew.php. |
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220817-180228 / LiuJ | Partial signatures (4). | |
220816-113312 / Afeke | Unitarity for groupoid representations (4). | |
220816-111340 / Afeke | Unitarity for groupoid representations (3). | |
220816-105958 / Afeke | Unitarity for groupoid representations (2). | |
220816-104557 / Afeke | Unitarity for groupoid representations. | |
220812-125924 / KAL | Listening to Newton-1301 (2) | |
220812-123644 / KAL | Listening to Newton-1301 | |
220810-100547 / LiuJ | Partial signatures (3). | |
220809-123425 / PoleDancing | The flipper. | |
220809-104022 / Afeke | Gassner as a functor (3). | |
220808-163148 / VanDerVeen | Band Aid marathon. | |
220805-123801 / Frohlich | Co-invariants marathon (3). | |
220805-104100 / Frohlich | Co-invariants marathon (2). | |
220805-092810 / Frohlich | Co-invariants marathon. | |
220804-164222 / LiuJ | Partial signatures (2). | |
220804-155757 / LiuJ | Partial signatures. | |
220804-130344 / Afeke | Gassner as a functor (2). | |
220804-125927 / Afeke | Gassner as a functor. | |
220606-144534 / Afeke | Gassner for a single crossing. | |
220603-150005 / Halacheva | Fast GPV computations (2). | |
220603-143552 / Halacheva | Fast GPV computations. | |
220322-104437 / 2122-257 | Closed -> exact, HW16 Q3 (3). | |
220322-103156 / 2122-257 | Closed -> exact, HW16 Q3 (2). | |
220322-101624 / 2122-257 | Closed -> exact, HW16 Q3. | |
220316-140256 / Afeke | LinAlg issue. | |
220308-105924 / 2122-257 | Fubini for layer-prseringfunctions. | |
220308-102037 / 2122-257 | The adjoint. | |
220308-101424 / 2122-257 | $\theta$. | |
220308-094753 / 2122-257 | Infinitesimal Stokes' Theorem. | |
211215-105403 / LiuJ | Listening to Dancso's talk in Montreal (2). | |
211215-102305 / LiuJ | Listening to Dancso's talk in Montreal. | |
211214-122202 / Afeke | Recovering Gassner from $H_1$ (3). | |
Date-Time / Prefix | Comment | |
211214-115545 / Afeke | Recovering Gassner from $H_1$ (2). | |
211209-140137 / Gupta | The Halting Problem and Godel's Theorem (2). | |
211209-133932 / Gupta | The Halting Problem and Godel's Theorem. | |
211130-172819 / Afeke | Recovering Gassner from $H_1$. | |
211123-165941 / Afeke | On to tangles! (5) | |
211123-164720 / Afeke | On to tangles! (4) | |
211123-161727 / Afeke | On to tangles! (3) | |
211116-164408 / Afeke | On to tangles! (2) | |
211116-163123 / Afeke | On to tangles! | |
211109-145132 / Abbasi | Proof of invariance of Kashaev's signature (6). | |
211109-145131 / Abbasi | Proof of invariance of Kashaev's signature (5). | |
211109-145130 / Abbasi | Proof of invariance of Kashaev's signature (4). | |
211109-145129 / Abbasi | Proof of invariance of Kashaev's signature (3). | |
211109-145128 / Abbasi | Proof of invariance of Kashaev's signature (2). | |
211109-145127 / Abbasi | Proof of invariance of Kashaev's signature. | |
211102-155035 / Afeke | The structure of the cup-product matrix (9). | |
211026-153454 / Afeke | The structure of the cup-product matrix (8). | |
211019-154103 / Afeke | The structure of the cup-product matrix (7). | |
211015-165626 / LiuJ | Bi-algebras, traces. | |
211012-153813 / Afeke | The structure of the cup-product matrix (6). | |
211008-165201 / LiuJ | Group-like elements. | |
211005-153836 / Afeke | The structure of the cup-product matrix (5). | |
210928-160007 / Afeke | The structure of the cup-product matrix (4). | |
210928-154030 / Afeke | The structure of the cup-product matrix (3). | |
210921-160425 / Afeke | The structure of the cup-product matrix (2). | |
210917-170117 / LiuJ | The associated graded of virtual knots. | |
210917-153555 / Frohlich | Traces and rotational virtual tangles. | |
210914-164623 / Afeke | The structure of the cup-product matrix. | |
210910-170725 / LiuJ | Finite generation. | |
210910-161101 / LiuJ | Expansions and UFTIs. | |
210728-142257 / KAL | Leonard Afeke on The Gassner Representation of String Links (4). | |
210728-142256 / KAL | Leonard Afeke on The Gassner Representation of String Links (3). | |
Date-Time / Prefix | Comment | |
210728-142255 / KAL | Leonard Afeke on The Gassner Representation of String Links (2). | |
210728-142254 / KAL | Leonard Afeke on The Gassner Representation of String Links. | |
210715-164340 / TangYC | Sketch of the proof of the planar separator theorem. | |
210701-170112 / Afeke | Completing the Kirk argument (6). | |
210701-170111 / Afeke | Completing the Kirk argument (5). | |
210701-170110 / Afeke | Completing the Kirk argument (4). | |
210630-113540 / Afeke | Supervisory Meeting (2). | |
210630-113539 / Afeke | Supervisory Meeting. | |
210624-165821 / Afeke | Completing the Kirk argument (3). | |
210624-165820 / Afeke | Completing the Kirk argument (2). | |
210624-165819 / Afeke | Completing the Kirk argument. | |
210608-103235 / VanDerVeen | Getting rid of $\hbar$. | |
210604-195914 / Afeke | Computing cup products (4). | |
210528-110135 / Afeke | Computing cup products (3). | |
210528-104400 / Afeke | Computing cup products (2). | |
210517-100249 / Afeke | Computing cup products. | |
210507-092613 / Afeke | More cohomology computations (5). | |
210507-092100 / Afeke | More cohomology computations (4). | |
210507-091439 / Afeke | More cohomology computations (3). | |
210429-152437 / Afeke | More cohomology computations (2). | |
210415-160909 / Afeke | More cohomology computations. | |
210208-164014 / Afeke | Cap products (2). | |
210208-163929 / Afeke | Cap products. | |
201211-153735 / Afeke | The twisted homology of $\partial X$. | |
201105-173823 / Afeke | Reading Kirk's email (2). | |
201105-170312 / Afeke | Reading Kirk's email. | |
201020-161550 / Afeke | Homological representations (2). | |
201020-161519 / Afeke | Homological representations. | |
200811-165033 / Afeke | A split sequence? | |
200729-155915 / Afeke | Crash recovery. | |
200724-160451 / Afeke | A crucial statement in Kassel-Turaev (6). | |
200720-154713 / Afeke | A crucial statement in Kassel-Turaev (5). | |
Date-Time / Prefix | Comment | |
200720-154633 / Afeke | A crucial statement in Kassel-Turaev (4). | |
200719-213611 / VanDerVeen | $t$ and $w$ generate the centre. | |
200717-173256 / VanDerVeen | Abbasi's argument. | |
200717-173027 / Abbasi | A short proof of McCool's theorem (3). | |
200717-173026 / Abbasi | A short proof of McCool's theorem (2). | |
200717-173025 / Abbasi | A short proof of McCool's theorem. | |
200715-155330 / Afeke | A crucial statement in Kassel-Turaev (3). | |
200714-145937 / Frohlich | Proofs of the Weyl commutation relations (2). | |
200714-145936 / Frohlich | Proofs of the Weyl commutation relations. | |
200714-125831 / Dror | Verifying the Heisenberg R-matrix. | |
200713-171423 / Gaudreau | uB injects into vB. | |
200713-160252 / Scherich | Long for w-braids. | |
200710-180818 / VanDerVeen | Traces. | |
200709-173838 / Afeke | A crucial statement in Kassel-Turaev (2). | |
200708-160203 / Frohlich | Are traces trascendental? | |
200703-175526 / VanDerVeen | Zipping quadratics and pairing exterior powers. | |
200703-160731 / Afeke | A crucial statement in Kassel-Turaev. | |
200702-161027 / Frohlich | The Halacheva trace. | |
200630-181150 / Abbasi | Basis conjugating automorphisms are generated by $\sigma_{ij}$ (2). | |
200630-181149 / Abbasi | Basis conjugating automorphisms are generated by $\sigma_{ij}$. | |
200630-181026 / VanDerVeen | Co-invariants, partial traces. | |
200627-114335 / Abbasi | Wormholes on $S^3$ (2). | |
200627-114334 / Abbasi | Wormholes on $S^3$. | |
200626-180156 / VanDerVeen | Mixed-direction homomorphisms. | |
200626-160403 / Frohlich | Partial traces. | |
200626-132922 / Afeke | $H_1({\mathbb R}^2,{\mathbb Z}^2)$. | |
200626-132921 / Afeke | The map $\pi_1\to H_1$ is homomorphic (3). | |
200625-171633 / Munasinghe | Understanding $sl_{2+}^\epsilon$. | |
200621-180015 / VanDerVeen | Heisenberg calculus (2). | |
200621-180014 / VanDerVeen | Heisenberg calculus. | |
200621-160318 / Dror | Switching to central variables. | |
200619-171742 / Scherich | Combing braids. | |
Date-Time / Prefix | Comment | |
200619-171741 / Scherich | Free groups in virtual braid groups. | |
200619-160001 / Abbasi | Towards a proof of McCool's theorem (7). | |
200619-160000 / Abbasi | Towards a proof of McCool's theorem (6). | |
200619-155959 / Abbasi | Towards a proof of McCool's theorem (5). | |
200618-180337 / VanDerVeen | Spinner challenge. | |
200618-175701 / VanDerVeen | Composition for O/U tangles. | |
200618-160602 / Munasinghe | A genus 2 surface. | |
200618-100914 / Meusburger | OU tangles and Hopf words. | |
200617-134608 / Afeke | The map $\pi_1\to H_1$ is homomorphic (2). | |
200616-182321 / Abbasi | Towards a proof of McCool's theorem (4). | |
200616-182320 / Abbasi | Towards a proof of McCool's theorem (3). | |
200616-182319 / Abbasi | Towards a proof of McCool's theorem (2). | |
200616-182318 / Abbasi | Towards a proof of McCool's theorem. | |
200615-194307 / Scherich | The Artin representation. | |
200615-172542 / Scherich | Long's $\rho^+$ construction (2). | |
200615-153139 / Afeke | The map $\pi_1\to H_1$ is homomorphic. | |
200612-182124 / VanDerVeen | Hopf quandles? | |
200612-154042 / Frohlich | Minor identities and Plucker coordinates. | |
200611-161506 / Abbasi | Gauss diagrams, w-braids. | |
200611-155616 / Munasinghe | A representation theory for ${\mathfrak{g}}_\epsilon^+$? | |
200610-183444 / Scherich | Long's $\rho^+$ construction. | |
200610-170726 / Afeke | Back to $\tilde{H}$ (7). | |
200610-170702 / Afeke | Back to $\tilde{H}$ (6). | |
200610-091024 / Dancso | A new(?) approach for solving KV degree by degree. | |
200609-175618 / VanDerVeen | Proof of connectivity. | |
200608-155824 / Afeke | Back to $\tilde{H}$ (5). | |
200603-084840 / Dancso | Expansions for acyclic tangles (3). | |
200603-084839 / Dancso | Expansions for acyclic tangles (2). | |
200601-170137 / Frohlich | Alexander Half Density and palindromicity. | |
200601-153318 / Afeke | Back to $\tilde{H}$ (4). | |
200601-100322 / Dror | Searching for the perfect OU tangle / VCD. | |
200529-165625 / Abbasi | Proof of injectivity (5). | |
Date-Time / Prefix | Comment | |
200529-165624 / Abbasi | Proof of injectivity (4). | |
200529-165623 / Abbasi | Proof of injectivity (3). | |
200529-165622 / Abbasi | Proof of injectivity (2). | |
200529-165621 / Abbasi | Proof of injectivity. | |
200529-105142 / Scherich | Generating the augmentation ideal. | |
200529-063354 / Dancso | Expansions for acyclic tangles. | |
200527-160353 / Afeke | Back to $\tilde{H}$ (3). | |
200525-154821 / Afeke | Back to $\tilde{H}$ (2). | |
200525-154403 / Afeke | Back to $\tilde{H}$. | |
200523-193626 / Dror | Asymptotic Expansions (2). | |
200523-193625 / Dror | Asymptotic Expansions. | |
200523-193429 / VanDerVeen | Z is central. | |
200519-163033 / Abbasi | Conjugators (2). | |
200519-162504 / Abbasi | Conjugators. | |
200519-150133 / Gaudreau | Bracelets. | |
200519-145927 / Gaudreau | $F=G^2$. | |
200518-195509 / Dror | Cinnamon Rolls with Filling. | |
200518-155434 / Afeke | The n-puncture case. | |
200515-165502 / Abbasi | Proving Artin's theorem (2). | |
200515-165501 / Abbasi | Proving Artin's theorem. | |
200515-145722 / Gaudreau | Reading Ito-Sakurai arXiv:2004.14785. | |
200514-081535 / Dror | Garside squared. | |
200513-170219 / Afeke | The relations between the $\alpha_n$'s (2). | |
200513-170218 / Afeke | The relations between the $\alpha_n$'s. | |
200513-160010 / Dror | The Golden Horseshoe. | |
200512-105355 / Dror | Cinnamon Rolls. | |
200510-195225 / Dror | A multi-diamond case. | |
200508-183718 / VanDerVeen | Diamonds (2). | |
200508-183717 / VanDerVeen | Diamonds. | |
200508-165606 / Dror | More shtrudels. | |
200507-172501 / Frohlich | Planar algebras and planar graphs (2). | |
200507-172500 / Frohlich | Planar algebras and planar graphs. | |
Date-Time / Prefix | Comment | |
200507-172329 / Dror | Shielding from R1/R2. | |
200506-181422 / VanDerVeen | Divisibility and overhangs. | |
200506-145051 / Gaudreau | All cut systems are equivalent (2). | |
200506-144914 / Gaudreau | All cut systems are equivalent. | |
200505-163633 / Abbasi | The Artin representation. | |
200505-150712 / ThurstonD | The Extraction Graph. | |
200504-165430 / Frohlich | Circle packings, Riemann mappings, and badly drawing knots. | |
200504-165429 / Dror | A simple extraction graph. | |
200504-165428 / Dror | Long diamonds (4). | |
200504-150105 / Afeke | The Abelianization of a kernel (6). | |
200504-113848 / Dror | Long diamonds (3). | |
200503-151147 / Dror | Long diamonds (2). | |
200503-151146 / Dror | Long diamonds. | |
200501-164439 / Scherich | OU and VCDs. | |
200430-165659 / Bellingeri | Mapping class groups and graphs. | |
200430-165512 / Dror | Chterental's counter(?)-example (2). | |
200429-163709 / Afeke | The Abelianization of a kernel (5). | |
200429-135311 / Dror | Chterental's counter(?)-example. | |
200429-124522 / Frohlich | Braid-like and cyclic R-moves. | |
200428-210337 / Dancso | The injectivity of $\bar{\Gamma}$ and the Diamond Lemma (2). | |
200428-210336 / Dancso | The injectivity of $\bar{\Gamma}$ and the Diamond Lemma. | |
200428-141031 / Dror | Another divisibility case. | |
200426-140132 / Dror | A bug in the divisibility lemma (2). | |
200425-195059 / Dror | A bug in the divisibility lemma. | |
200425-192517 / Chterental | Some diamonds (3). | |
200425-173535 / Chterental | Some diamonds (2). | |
200425-172053 / Chterental | Some diamonds. | |
200425-111054 / Gaudreau | Kamada's construction (3). | |
200425-111053 / Dror | Lemmas about crossing number. | |
200424-160332 / Frohlich | Random. | |
200424-150653 / Scherich | A multivariable LKB? | |
200424-150652 / Dror | Dealing with R1 (2). | |
Date-Time / Prefix | Comment | |
200424-150651 / Dror | Dealing with R1. | |
200423-171420 / Afeke | The Abelianization of a kernel (4). | |
200423-171419 / Afeke | Implementing Fox derivatives. | |
200422-151530 / Frohlich | Yarn balls and complexity. | |
200421-180229 / VanDerVeen | The Diamond Lemma. | |
200420-095233 / Dror | R1 issues. | |
200417-180125 / VanDerVeen | Riemann mappings and mapping-classs-vector-fields. | |
200417-170148 / Afeke | Back to $\tilde{H}$. | |
200417-170053 / Afeke | The Abelianization of a kernel (3). | |
200417-165539 / Afeke | The Abelianization of a kernel (2). | |
200417-165412 / Dror | $\beta|T$. | |
200415-170946 / Afeke | The Abelianization of a kernel. | |
200415-142703 / Dror | Every UO fixing process terminates. | |
200414-182305 / VanDerVeen | Aiming to separate vOU tangles with quantum invariants. | |
200414-124207 / Dror | A possible problem case. | |
200411-180721 / VanDerVeen | Virtual surgeries. | |
200411-144200 / Afeke | $\tilde{H}$ in Kassel-Turaev 3.2.1 (2). | |
200408-181534 / VanDerVeen | Random | |
200407-152413 / Afeke | $\tilde{H}$ in Kassel-Turaev 3.2.1. | |
200405-185919 / VanDerVeen | The injectivity of PvB->OU, following Chterental (3). | |
200405-185918 / VanDerVeen | The injectivity of PvB->OU, following Chterental (2). | |
200405-185917 / VanDerVeen | The injectivity of PvB->OU, following Chterental. | |
200405-152214 / Dror | Uniqueness of OU forms? | |
200404-172259 / Gaudreau | Kamada's construction (2). | |
200404-172258 / Gaudreau | Kamada's construction. | |
200404-150338 / Afeke | Relative homology (2). | |
200404-150149 / Afeke | Relative homology. | |
200403-160356 / Dror | Reductive OU tangles (2). | |
200403-160355 / Dror | Reductive OU tangles. | |
200401-151306 / Scherich | An up-then-down braid equivalence. | |
200401-151305 / Dror | Random (2). | |
200330-192515 / VanDerVeen | Associators and 6j symbols. |
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