© | Dror Bar-Natan: Odds, Ends, Unfinished: Random

Blackboard Shots

08401 Alekseev Archibald Burgos Chu Dancso Friday Godin Halacheva KAL Kauffman LeeP Leung McLellan Papakonstantinou Putyra Zhang

Date-Time Prefix Comment What? A collection of Blackboard Shots (131, right now), mostly taken in my office using a purpose-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 tripod-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, loadnew.php, random.php, the JavaScript actions.js, and the icon bbs.jpg.

Exceptions. Some shots are taken by other means and are added manually or using loadnew.php.

080428-120622 08401 HW9 Q1.
080428-110459 08401 P366 Q12 and Q16.
080428-101755 08401 P561 Q18.
080425-160048 08401 P289 Q53.
080425-153014 08401 P379 Q32.
080425-150914 08401 P378 Q24.
080425-143825 08401 2007 Q7 (2).
080425-142418 08401 2007 Q7. (more...)
080423-133821 KAL Welded knots following Kauffman (2).
080423-133815 KAL Welded knots following Kauffman. (more...)
080418-170631 Friday #P
080416-141506 KAL Quandles and Lie Algebras (3).
080416-141452 KAL Quandles and Lie Algebras (2).
080416-141439 KAL Quandles and Lie Algebras. (more...)
080415-113735 LeeP Quadratic Algebras (2).
080415-103815 LeeP Quadratic Algebras.
080411-095902 Friday Mermin's experiment.
080409-140303 KAL TAut (3).
080409-140247 KAL TAut (2).
080409-140230 KAL TAut. (more...)
080407-154716 Zhang Kassel III.3: Hopf Algebras.
080407-142000 LeeP Resolution of A_3, formality.
080404-174051 Friday Polynomials with prime values; splitting extensions.
080402-135635 KAL Infinitesimal Artin and homotopy (3).
080402-135624 KAL Infinitesimal Artin and homotopy (2).
080402-135612 KAL Infinitesimal Artin and homotopy. (more...)
080331-121214 Zhang Kassel III.2: Bialgebras (3).
080331-115042 Zhang Kassel III.2: Bialgebras (2).
080331-113921 Zhang Kassel III.2: Bialgebras.
080331-113101 Zhang Kassel III.1: Coalgebras.
080326-134857 KAL Chord diagrams modulo homotopy (3).
080326-134831 KAL Chord diagrams modulo homotopy (2).
080326-134823 KAL Chord diagrams modulo homotopy. (more...)
080324-133753 Zhang Kassel I.6: Graded and Filtered Algebras.
080319-134555 KAL The infinitesimalization of the Artin representation (5).
080319-134538 KAL The infinitesimalization of the Artin representation (4).
080319-134530 KAL The infinitesimalization of the Artin representation (3). (more...)
080317-173748 Burgos Signs for Property A.
080314-174925 Papakonstantinou Proof of Radon.
080314-171334 Papakonstantinou Deleted joins (3).
080314-165812 Papakonstantinou Deleted joins (2).
080314-164552 Papakonstantinou Deleted joins.
080314-123029 LeeP BCH in arrow diagrams. (more...)
080312-134159 KAL The infinitesimalization of the Artin representation (2).
080312-134147 KAL The infinitesimalization of the Artin representation. (more...)
080311-141014 Putyra The new relations.
080311-140156 Putyra The functor into Vect.
080310-133415 Burgos Property A.
080307-164557 LeeP The frozen foot braidor equations and the Kurlin solution.
080307-093138 Friday Not, nand and error correction.
080306-153403 Zhang Kassel II.4: Tensor products of algebras.
080305-144135 Putyra Knot at Lunch talk (4).
080305-144122 Putyra Knot at Lunch talk (3).
080305-140905 Putyra Knot at Lunch talk (2).
080305-140854 Putyra Knot at Lunch talk. (more...)
080304-154327 Halacheva The construction of purple.
080229-171901 Papakonstantinou Proof of baby Radon.
080229-171109 Papakonstantinou Deleted products.
080229-170400 Papakonstantinou Properties of ind_Z/2.
080229-165636 Papakonstantinou Z/2 spaces.
080229-162628 Papakonstantinou Van Kampen-Flores and topological Radon.
080229-153603 Leung Blobs in arrow diagrams.
080229-120610 LeeP Acyclicity in Aarrow and Barrow.
080229-102814 Friday XOR Life and transistors.
080228-145513 Putyra The 8 versions of Khovanov - Ozsvath - Rasmussen - Szabo homology.
080227-150545 Chu Proof of Artin's theorem (2). (more...)
080227-150515 Chu Proof of Artin's theorem. (more...)
080222-115052 LeeP The frozen foot braidor equations. (more...)
080222-100029 Friday Euler's theorem.
080222-094417 Friday Simple linkages (2).
080221-145629 Burgos Forest expansions.
080221-115556 Zhang Kassel 2.1: Tensor Products (3)
080221-114426 Zhang Kassel 2.1: Tensor Products (2)
080221-112622 Zhang Kassel 2.1: Tensor Products
080219-153645 Halacheva The Descending Realization.
080219-135641 Archibald Fermion formulas for cables.
080218-114301 Zhang Kassel: 1.6 (2).
080218-111608 Zhang Kassel: 1.6.
080211-113943 Zhang Kassel: 1.5.
080211-112734 Zhang Kassel: 1.3, 1.4.
080211-105440 Archibald Alexander, half-densities and the Berezin integral.
080208-170810 Papakonstantinou Proof of Lovasz-Kneser.
080208-164720 Papakonstantinou The Lovasz-Kneser Theorem.
080208-163644 Papakonstantinou The Hobby-Rice theorem.
080208-162526 Papakonstantinou General position Salad Bowl.
080207-160009 Archibald The target planar algebra for Alexander.
080207-150121 Burgos 2
080207-145111 Burgos A spanning tree expansion of the Jones polynomial.
080206-144329 Godin 4
080206-120027 Godin 3
080206-114022 Godin 2
080206-112111 Godin A string topology complex for knots, 1.
080205-153936 Halacheva The map TP from virtual knot diagrams to knots.
080204-153848 Dancso Non-uniqueness of associators and KTG invariants.
080204-140210 LeeP A simple group theory proof using expansions.
080201-170104 Papakonstantinou Rainbow d-tuples and the necklace theorem.
080201-163941 Papakonstantinou A discrete salad bowl theorem (does it have honest applications?).
080131-151919 Leung A proof of 6T for gl(N).
080129-162421 Leung The weight system of the bialgebra associated with a semi-simple Lie algebra.
080128-152738 Dancso 3-pt renormalization of the Kontsevich integral.
080128-115751 Zhang Affine lines, planes, and algebras.
080125-164947 Papakonstantinou Geometric proof of Borsuk-Ulam, 2.
080125-162554 Papakonstantinou Geometric proof of Borsuk-Ulam.
080125-144941 LeeP Braidors with no linear term.
080125-103323 Friday Simple linkages.
080124-145708 Burgos Products of on-diagonal complexes.
080122-161345 Archibald Fermion formulas for Alexander.
080122-155648 Archibald Deriving the smoothing formula.
080121-110258 Alekseev Other quotients.
080121-104944 Alekseev Homology of tder.
080121-103517 Alekseev Trees and sder.
080121-094839 Alekseev Relation with grt.
080121-093327 Alekseev Definition of div.
080116-162451 Alekseev Classes of derivations on free Lie algebras.
080111-172610 Papakonstantinou Proof of Tucker, 2.
080111-171028 Papakonstantinou Proof of Tucker, 1.
080111-164836 Papakonstantinou Tucker's Lemma.
080111-163734 Papakonstantinou A combinatorial Borsuk-Ulam.
080111-160938 Halacheva More on S and Virtualize.
080108-161737 Archibald Cont.
080108-155928 Archibald Alexander for virtuals.
080107-131105 McLellan Equivariant cohomology and universal properties
071219-170039 LeeP Trying to understand Hall bases
071218-142600 McLellan MPR and Manoliu
071218-121134 Halacheva S and Sinv
071214-182203 Chu Lyndon words.
071214-144306 LeeP "functional" application of linear laws.
071213-160320 Burgos What we want from the Jones poly of alternating tangles.
071213-142750 Leung The SO(2N) Lie bialgebra weight system.
070117-101500 Dancso 16 definitions of the Alexander polynomial (more).
010105-122901 Kauffman Welded knots in Siegen. (more...)