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01:24:59 ECS20 - W22 - Lecture 13 (7T): Induction and… ECS20 - W22 - Lecture 13 (7T): Induction and Recursion 2	ECS20 - W22 - Lecture 13 (7T): Induction and Recursion 2 Lecture 2022-02-15. A proof by strong induction: the Fundamental Theorem of Arithmetic. Induction on a definition: boolean formulas have the same number of left and right parentheses. Recursion as a… induction parentheses primes formula rings algorithm peg symbols tic-tac-toe towers of hanoi fundamental theorem of arithmetic From Phil Rogaway 0 likes 106 plays 0
01:20:06 ECS20 - W22 - Lecture 3 (2T): Logic 2 ECS20 - W22 - Lecture 3 (2T): Logic 2	ECS20 - W22 - Lecture 3 (2T): Logic 2 Review (particularly of functional completeness). More boolean operators: IMPLIES, IFF, XOR, NAND, NOR. Gates and circuits. A formal treatment of boolean formulas: syntax, truth assignments, and… boolean operators implies xor iff truth assignment truth table equivalence functional completeness nand nor gate circuit truth formula symbols symbol phi parentheses table formulas operators meaning values function assignment operator From Phil Rogaway 0 likes 172 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 0 likes 155 plays 0
11:48 ECS 120 2b:3 formal definition of CFG semantics ECS 120 2b:3 formal definition of CFG semantics	ECS 120 2b:3 formal definition of CFG semantics string parentheses arrow rule cfg statement derivation sequence strings language context couple epsilon grammar programming tree terminals rules languages parse From David Doty 1 likes 185 plays 0
07:20 ECS 120 2b:1 CFG introduction ECS 120 2b:1 CFG introduction	ECS 120 2b:1 CFG introduction rule parentheses variable symbol colon context string strings side rules thing zeros start a1 grammar epsilon language things grammars b. From David Doty 1 likes 228 plays 0
10:01 ECS 120 2a:3 conventions and the tree view of… ECS 120 2a:3 conventions and the tree view of regex_s	ECS 120 2a:3 conventions and the tree view of regex_s expression union concatenation star thing precedence times expressions parentheses operations language string bit tree associativity base left b. things dfa From David Doty 1 likes 153 plays 0
10:23 ECS 120 2a:2 regex formal definition ECS 120 2a:2 regex formal definition	ECS 120 2a:2 regex formal definition string symbol expression language parentheses alphabet cases symbols r2 star r1 concatenation base union expressions input syntax definition operator rejects From David Doty 1 likes 180 plays 0