© | Dror Bar-Natan: Academic Pensieve: Blackboard Shots: Random

Blackboard Shots with Prefix "Chu"


140702-170358: A problem around Vogel.

140623-134309: Fox-Milnor.

131204-070904: Bubble-wrap finite-type.

130826-145813: Injectivity of ${\mathcal A}^u\to{\mathcal A}^w$.

130715-173244: Analyzing Enriquez-style diagrams.

130603-171343: An expansion for $f{\mathcal K}$.

130401-182129: Acyclic Hopf words are not flat-knot words.

130401-173631: Cycle counts and intersection matrices.

130327-173041: Red over blue and acyclic Hopf diagrams.

130325-185130: A basis for $\gamma$ calculus?

130318-182609: An extra relation in the 2D case (2).

130318-174733: An extra relation in the 2D case.

130311-180121: Bases for the blob quotient, sl(2).

130304-140654: The Polyak-Ohtsuki theorem.

130225-134301: The two non-commutative 2D Lie bi-algebras.

121221-151142: Finger moves in Gauss diagrams.

121203-153628: Enriquez' second differential.

121102-170951: The basic complex.

121019-155922: Things homologous to multi-shuffles.

121005-162258: Guesses about homologies by Enriquez.

120921-154350: A funny combination from Drinfel'd Quasi-Hopf paper.

120912-161406: Enriquez' universal space (2).

120614-151118: Enriquez' universal space.

120515-172112: A typical basic descending virtual.

120420-124445: An R3-XII syzygy.

120420-115342: Injectivity of the Magnus expansion.

120109-154339: Braids inject into tangles.

110901-173210: The V equations at x=y and at x=-y (2).

110831-165023: The V equations at x=y and at x=-y.

110823-132528: W half twist and vertex (2)

110823-124025: W half twist and vertex

110630-172732: A quick proof of the n! result.

110331-181618: Groebner bases for non-commutative associative algebras (3).

110331-173958: Groebner bases for non-commutative associative algebras (2).

110331-172300: Groebner bases for non-commutative associative algebras.

110330-175555: A basis for descending arrow diagrams (2).

110330-171802: A basis for descending arrow diagrams.

110224-182926: Classifying flat long virtual knots (5).

110224-173852: Classifying flat long virtual knots (4).

110224-172818: Classifying flat long virtual knots (3).

110224-170823: Classifying flat long virtual knots (2).

110224-165934: Classifying flat long virtual knots.

100209-143432: A XII-6T syzygy.

100114-160330: Questions on A^whor.

100107-153019: A combable group between wB and vB?

091109-141924: A basis for A(vB). (more...)

091002-104233: The projectivization of semi-direct products (3).

091002-100622: The projectivization of semi-direct products (2).

091002-095413: The projectivization of semi-direct products.

090918-142200: VK_4

090831-153650: Proj is a kernel.

090624-125725: On Bardakov (6).

090624-122008: On Bardakov (5).

090624-113937: On Bardakov (4).

090624-112524: On Bardakov (3).

090624-110705: On Bardakov (2).

090624-101231: On Bardakov.

090623-153638: Generators and relations for Sn.

090517-161026: Is proj computable for groups?

090421-134223: Combing wB3 (3).

090421-132922: Combing wB3 (2).

090421-131429: Combing wB3.

090421-130344: Combing VB4.

090403-121202: Conjugation and commutators (2).

090327-120327: Conjugation and commutators.

090317-142002: Combing 3-strand w-braids.

090225-155144: Reidemeister Schreier (3).

090225-153417: Reidemeister Schreier (2).

090225-151457: Reidemeister Schreier. (more...)

090209-143653: Tietze Transformations.

090202-150138: Four proofs of the Fundamental Theorem.

090119-162218: Freeness inside PB_n.

081219-184628: Braids modulo homotopy.

081219-170221: Towards combing w-braids.

081219-162251: Combing virtual braids.

081211-134219: Ore's Theorem (6).

081211-134206: Ore's Theorem (5).

081211-131635: Ore's Theorem (4).

081211-131625: Ore's Theorem (3).

081211-125501: Ore's Theorem (2).

081211-125447: Ore's Theorem. (more...)

081210-140305: pA of w-braids.

081203-141829: MacLane Coherence.

081126-145005: More on Ore (2).

081126-135820: More on Ore.

081114-172259: Ore's theorem.

081113-140917: Garside and positive braids (6).

081113-140906: Garside and positive braids (5).

081113-132932: Garside and positive braids (4).

081113-132914: Garside and positive braids (3).

081113-131119: Garside and positive braids (2).

081113-131059: Garside and positive braids. (more...)

081112-120606: VPB, VB, S.

081022-122617: Naive projectivization of B_n.

080804-120120: Real life motion groups.

080710-114815: A new form for the triple point.

080227-150545: Proof of Artin's theorem (2). (more...)

080227-150515: Proof of Artin's theorem. (more...)

071214-182203: Lyndon words.