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David Lewis

Apparently, this user prefers to keep an air of mystery about them.

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  • Boston, MA, US
  • Member for 8 years, 11 months
  • 106 profile views
  • Last seen May 28 '18 at 8:34

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28 Why is a regular language called 'regular'? May 10 '12
15 Are there undecidable properties of non-turing-complete automata? May 6 '12
13 Relation between simple and regular grammars May 21 '12
10 Is $A=\{ w \in \{a,b,c\}^* \mid \#_a(w)+ 2\#_b(w) = 3\#_c(w)\}$ a CFG? Apr 28 '12
9 Are the Before and After sets for context-free grammars always context-free? Mar 26 '12
8 $L(M) = L$ where $M$ is a $TM$ that moves only to the right side so $L$ is regular May 10 '12
8 Language of the values of an affine function Mar 22 '12
7 Logic gates from everyday materials Mar 27 '12
6 Is a PDA as powerful as a CPU? May 16 '12
6 Words that have the same right- and left-associative product Apr 24 '12
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