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|current||14:35, 8 October 2009||950 × 465 (33 KB)||Matteo Cavaliere||To each sentential form produced by the grammar <math> G </math> the observer <math> A </math> associates a symbol that can be <math> a,b,c,\bot </math> or the empty symbol <math> \lambda </math> (the vertical arrow is the observer mapping). Thus|
|14:33, 8 October 2009||950 × 465 (33 KB)||Matteo Cavaliere|