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12:25 ECS 120 0:7 combinatorics (discrete math review) ECS 120 0:7 combinatorics (discrete math review)	ECS 120 0:7 combinatorics (discrete math review) length strings ways times string elements n. element pants subsets bit shirts combinatorics sequence rule subset children power outfits permutations From David Doty on March 25th, 2021 0 likes 112 plays 0
01:19:33 ECS 289A Lecture 3a ECS 289A Lecture 3a	ECS 289A Lecture 3a tiles shape tile probability thing string question length determinism delta heads variables times assembly power types coin clause algorithm problem From David Doty on March 22nd, 2021 0 likes 0 plays 0
01:10:06 ECS 289A Lecture 2b ECS 289A Lecture 2b	ECS 289A Lecture 2b tile shape tiles machine thing point turing computation points types sort bit assembly tape input log shapes tree subset string From David Doty on March 22nd, 2021 0 likes 1 plays 0
11:57 ECS 220 8c:8.6-1 Reachability expressed… ECS 220 8c:8.6-1 Reachability expressed logically, and as a game between prover and skeptic	ECS 220 8c:8.6-1 Reachability expressed logically, and as a game between prover and skeptic edge path nodes length reachability phi midpoint size quantifiers input steps graph string idea space witnesses step b1 a1 skeptic From David Doty on March 21st, 2021 0 likes 1 plays 0
08:11 ECS 220 7a:7.6-2 Turing universality of 3-counter… ECS 220 7a:7.6-2 Turing universality of 3-counter machines	ECS 220 7a:7.6-2 Turing universality of 3-counter machines tape machine head turing bit bits end string counters counter half integer blank blanks configuration memory division pause change effect From David Doty on March 21st, 2021 0 likes 2 plays 0
05:26 ECS 220 6c:7.2-4 Gödel’s… ECS 220 6c:7.2-4 Gödel’s Incompleteness Theorem (consistency)	ECS 220 6c:7.2-4 Gödel’s Incompleteness Theorem (consistency) proof string epsilon guessing statement answer problem input algorithm godel completeness consistency searches theorem computation prove air negation programs contradiction From David Doty on March 21st, 2021 0 likes 1 plays 0
05:55 ECS 220 6c:7.2-2 From undecidable problems to… ECS 220 6c:7.2-2 From undecidable problems to unprovable truths	ECS 220 6c:7.2-2 From undecidable problems to unprovable truths statement rules proof axioms inference statements proofs contradiction reasoning thing systems hilbert 30s bit answer algorithm string kind negation properties From David Doty on March 21st, 2021 0 likes 2 plays 0
04:57 ECS 220 6c:7.2-1 arithmetical hierarchy ECS 220 6c:7.2-1 arithmetical hierarchy	ECS 220 6c:7.2-1 arithmetical hierarchy sigma pi hierarchy language level languages input string exercise complement subset searches steps exists predicate cetera definition bottom words deck From David Doty on March 21st, 2021 0 likes 1 plays 0
08:46 ECS 220 6b:7.2-2 showing problems are undecidable… ECS 220 6b:7.2-2 showing problems are undecidable by reduction from halting problem	ECS 220 6b:7.2-2 showing problems are undecidable by reduction from halting problem input problem epsilon question string thing reduction problems halts output behavior lot divisor x. function notion circuit numbers proof condition From David Doty on March 21st, 2021 0 likes 2 plays 0
06:00 ECS 220 6b:7.2-1 halting problem ECS 220 6b:7.2-1 halting problem	ECS 220 6b:7.2-1 halting problem input halts catch-22 programs inputs source problem table contradiction proof string rows coder diagonalization kind subroutine algorithm problems class output From David Doty on March 21st, 2021 0 likes 4 plays 0
09:25 ECS 220 5b:6.6-4 two lemmas and full proof of… ECS 220 5b:6.6-4 two lemmas and full proof of Ladner_s theorem	ECS 220 5b:6.6-4 two lemmas and full proof of Ladner_s theorem clique strings statement stage steps qi a. y. problem length lemma string input table answer statements language conditions condition return From David Doty on March 21st, 2021 0 likes 12 plays 0
07:35 ECS 220 5b:6.6-2 almost proof of Ladner's… ECS 220 5b:6.6-2 almost proof of Ladner's theorem	ECS 220 5b:6.6-2 almost proof of Ladner's theorem clique stage stages programs q0 strings string output problem x. point reduction np formula proof bees a. input reductions booleans From David Doty on March 21st, 2021 0 likes 10 plays 0
07:45 ECS 220 5b:6.6-1 Ladner's theorem, existence… ECS 220 5b:6.6-1 Ladner's theorem, existence of NP-intermediate problems	ECS 220 5b:6.6-1 Ladner's theorem, existence of NP-intermediate problems problem np string problems theorem length a. answers strings satisfiability evidence complete clique things answer language sac words x. numbers From David Doty on March 21st, 2021 0 likes 12 plays 0
07:59 ECS 220 5a:6.4-5 an oracle making P≠NP ECS 220 5a:6.4-5 an oracle making P≠NP	ECS 220 5a:6.4-5 an oracle making P≠NP string length probability oracle query strings queries b. fact lengths n. probabilistically infinity answer half input problem denominator times output From David Doty on March 21st, 2021 0 likes 12 plays 0
02:44 ECS 220 4b:6.1-1 time constructible functions ECS 220 4b:6.1-1 time constructible functions	ECS 220 4b:6.1-1 time constructible functions function string input machine n. length words sort constructable cetera steps outputs bounds functions t. theorems problem halts turing times From David Doty on March 21st, 2021 0 likes 15 plays 0
07:19 ECS 220 4a:6.1-3 collapse propagates up padding… ECS 220 4a:6.1-3 collapse propagates up padding technique	ECS 220 4a:6.1-3 collapse propagates up padding technique input length cubed algorithm deterministically problem question linear string x. end padding proof fact np cube function lot size season From David Doty on March 21st, 2021 0 likes 17 plays 0