Slide 1Fall 2003Costas Busch - RPI1 Properties of Context-Free languages Slide 2 Fall 2003Costas Busch - RPI2 Context-free languages are closed under: Union is context free…
Slide 1Fall 2006Costas Busch - RPI1 Decidable Languages Slide 2 Fall 2006Costas Busch - RPI2 Recall that: A language is Turing-Acceptable if there is a Turing machine that…
Slide 1 Fall 2006Costas Busch - RPI1 Turing’s Thesis Slide 2 Fall 2006Costas Busch - RPI2 Turing’s thesis (1930): Any computation carried out by mechanical means can…
Slide 1 Costas Busch - RPI1 More Applications of the Pumping Lemma Slide 2 Costas Busch - RPI2 The Pumping Lemma: Given a infinite regular language there exists an integer…
Slide 1 Fall 2006Costas Busch - RPI1 Languages Slide 2 Fall 2006Costas Busch - RPI2 Language: a set of strings String: a sequence of symbols from some alphabet Example: Strings:…