Formal languages and automata:
Give a regular expression for L={anbm:n?2,m?1,nm?3}
Formal languages and automata: Give a regular expression for L={anbm:n?2,m?1,nm?3}
formal languages and automata
Construct an NPDA for accepting the language L = {ww^R: we {a, b}*}
Formal Languages and Automata Theory
Q2. Give context-free grammars that generate the following language: { w є {0, 1} | w contains at least three 1's)
3" (25%) Give regular expressions for the following languages on {a, b). (a) L,-(a"b": n 4, m 3) (b) The complement of Li. (c) L- (w: w mod 3 03. Note: lw: the length of w (d) L3 w: |w mod 30 naww) appear)
3" (25%) Give regular expressions for the following languages on {a, b). (a) L,-(a"b": n 4, m 3) (b) The complement of Li. (c) L- (w: w mod 3 03. Note: lw: the length of w...
Automata Theory - Finding a regular expression for each of the following languages over {a,b} or {0,1}: I've written the solution . Please show steps on how to approach the problems that I mentioned in parentheses. The ones where I put my own regular expression check and see if it's still right. Thanks Strings with .... odd # of a's ---> (b*ab*ab*)b*ab* even # of 1's ---> 0*(10*10*)* ---> my answer was 0*10*10* (is this still right?) start & end...
L = {w|w contains the substring bab} give the regular expression that describes L are the 2 languages L and L* the same language? Is L(aba)* a regular language?
Formal Languages & Automata Theory 1411372
Pages 133,134
Problems: 7(a,b), 8 (b,c)
5.1 CoNTEXT-FREE GRAMMARS 133 EXERGISES 7. Find context-free grammars for the following languages (with n 2 0, m 0) (a) L = {a"b"": n < m + 3).
Finite Automata and regular Expression Given the following Finite automata: 1. 0, 1 0, 1 0, 1 What regular expression does it accept?
HW03 - 1 to 4
Problem 1 Find a regular expression for the set ^a"bm: (n + m) is odd Problem 2 Give regular expressions for the following languages. 3. The complement of L 4. The complement of L2 Problem 3 Find a regular expression for L = {w: na(w) and nb(w) are both even } Problem 4 Find dfa's that accept the following languages A. L-L(ab a)UL((ab) ba)
Programming Languages Final Exam Name: Question 1 (15 points) Give a regular expression for each of the following languages over = {0,1,2). 1. All strings that begin with 1 and end with 2. 2. All strings that contain exactly three 1's. For example, "0101012" is valid. 3. All strings in which the digits are non-decreasing. For example, "002" is valid, but "102" is not.
THEOREM 3.1 Let r be a regular expression. Then there exists some nondeteministic finite accepter that accepts L (r) Consequently, L () is a regular language. Proof: We begin with automata that accept the languages for the simple regular expressions ø, 2, and a E . These are shown in Figure 3.1(a), (b), and (c), respectively. Assume now that we have automata M (r) and M (r) that accept languages denoted by regular expressions ri and r respectively. We need...