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06:12 ECS 220 8a:8.1-2 space-bounded complexity classes… ECS 220 8a:8.1-2 space-bounded complexity classes L and PSPACE	ECS 220 8a:8.1-2 space-bounded complexity classes L and PSPACE space log configuration bits memory orbit input problems symbol pointer pointers class n. classes complexity x. rules size ca rule From David Doty on March 21st, 2021 0 likes 17 plays 0
08:56 ECS 220 7c:7.5-1 Turing's applied philosophy ECS 220 7c:7.5-1 Turing's applied philosophy	ECS 220 7c:7.5-1 Turing's applied philosophy calculus computer paper problem functions lambda function computation question person definition mind instructions machine church hilbert note symbol symbols computers From David Doty on March 21st, 2021 0 likes 10 plays 0
03:08 ECS 220 6a:7.2-1 programming languages with… ECS 220 6a:7.2-1 programming languages with interpreters have non-halting programs	ECS 220 6a:7.2-1 programming languages with interpreters have non-halting programs input programs language programming interpreter source output return javascript universality notion words matter contradiction runs v0 returns symbol question task From David Doty on March 21st, 2021 0 likes 21 plays 0
06:34 ECS 220 3a:5-5.2 circuit to simulate Turing… ECS 220 3a:5-5.2 circuit to simulate Turing machine, Witness-Existence reduces to Circuit-SAT	ECS 220 3a:5-5.2 circuit to simulate Turing machine, Witness-Existence reduces to Circuit-SAT tape circuit machine turing input gates subcircuit configuration witness space steps inputs cells bits head constants output symbol blanks width From David Doty on March 21st, 2021 0 likes 18 plays 0
04:47 ECS 120 8a:3 introduction to NP-completeness and… ECS 120 8a:3 introduction to NP-completeness and Boolean formulas	ECS 120 8a:3 introduction to NP-completeness and Boolean formulas np problem problems precedence formula negation end algorithm multiplication bar numbers equals table truth symbol sense words completeness parentheses print From David Doty on March 20th, 2021 0 likes 86 plays 0
11:37 ECS 120 6a:3 single-tape TMs can simulate… ECS 120 6a:3 single-tape TMs can simulate multitape TMs	ECS 120 6a:3 single-tape TMs can simulate multitape TMs tape configuration symbols dot head symbol blank position blanks tapes alphabet transition machine thing x. cell point multi loops dots From David Doty on March 20th, 2021 0 likes 124 plays 0
14:55 ECS 120 5c:4 formal definition of TM semantics ECS 120 5c:4 formal definition of TM semantics	ECS 120 5c:4 formal definition of TM semantics errata: At 4:38, I incorrectly said and wrote that L,R,S correspond to +1, -1, and 0. They correspond to -1, +1, and 0, i.e., moving left (L) decrements (-1) the tape head position, and moving right… tape configuration position turing symbol machine sequence prime head delta input content move configurations leftmost string semantics dfa constraints words From David Doty on March 20th, 2021 0 likes 97 plays 0
08:09 ECS 120 5c:3 formal definition of TM syntax ECS 120 5c:3 formal definition of TM syntax	ECS 120 5c:3 formal definition of TM syntax alphabet element tape input gamma function transition sigma start machine delta blank things turing qa elements symbol head range arrow From David Doty on March 20th, 2021 0 likes 109 plays 0
13:26 ECS 120 5c:2 example TM ECS 120 5c:2 example TM	ECS 120 5c:2 example TM symbol bit transition blank tape machine reverse end input string head simulator transitions x. symbols language arrow beginning side bits From David Doty on March 20th, 2021 0 likes 127 plays 0
04:39 ECS 120 5c:1 introduction to Turing machines (TM) ECS 120 5c:1 introduction to Turing machines (TM)	ECS 120 5c:1 introduction to Turing machines (TM) machine tape input turing symbol symbols difference machines elements head alphabet memory control bit haldane point language programming universe object From David Doty on March 20th, 2021 0 likes 109 plays 0
05:07 ECS 120 5b:7 pumping lemma proof that 1n2 is not… ECS 120 5b:7 pumping lemma proof that 1n2 is not regular	ECS 120 5b:7 pumping lemma proof that 1n2 is not regular length prime string l. lemma w. b. copy lengths strings contradiction zeros symbol fact languages animal hook y. xyz cancel From David Doty on March 20th, 2021 0 likes 56 plays 0
17:39 ECS 120 5a:2 direct proof that equal zero-one is… ECS 120 5a:2 direct proof that equal zero-one is not regular	ECS 120 5a:2 direct proof that equal zero-one is not regular string zeros delta hat dfa sequence w. answer p. words language cycle xyz q0 substring element symbol copy rest qi From David Doty on March 20th, 2021 0 likes 71 plays 0
08:16 ECS 120 5a:1 why we need rigor to argue that a… ECS 120 5a:1 why we need rigor to argue that a language is not regular	ECS 120 5a:1 why we need rigor to argue that a language is not regular zeros dfa strings string symbol language instance difference form prime times x. substring languages fact starting argument point runs substrings From David Doty on March 20th, 2021 0 likes 74 plays 0
08:18 ECS 120 4c:1 NFAs can simulate regex_s proof ECS 120 4c:1 NFAs can simulate regex_s proof	ECS 120 4c:1 NFAs can simulate regex_s proof nfa cases expressions language union base expression r2 string star languages r1 element symbol sigma input decidable proof b. concatenation From David Doty on March 20th, 2021 0 likes 86 plays 0
05:16 ECS 120 4b:2 RRGs can simulate DFAs proof ECS 120 4b:2 RRGs can simulate DFAs proof	ECS 120 4b:2 RRGs can simulate DFAs proof string rule sequence production d. start transition computation variable subset rules epsilon values g. grammar dfa symbol hindi pre definition From David Doty on March 20th, 2021 0 likes 75 plays 0
14:44 ECS 120 4a:2 example of DFA simulating NFA… ECS 120 4a:2 example of DFA simulating NFA (subset construction)	ECS 120 4a:2 example of DFA simulating NFA (subset construction) input transition epsilon nfa union subsets transitions subset start dfa symbol arrows a. b. words sets n. proof picture arrow From David Doty on March 20th, 2021 0 likes 139 plays 0