Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Build DPDA to show that the language L = {〖(ab)〗^(n ) aaa〖(ba)〗^(n-2) | n>2} is deterministic context free
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- Q4: Let Σ = {0, 1, #} and define a language B over Σ as follows: B = {r#s: r,s = {0, 1}^*, r is a substring of s}. Prove that the language B is not context freearrow_forwardI need help Implementing a parser for the context-free grammar using Java Develop a parser that can take a sentence generated by the context-free grammar and parse it into a parse tree, which can be used to represent the structure of the sentence. In Java. Please follow the examplearrow_forwardShow that the following language is decidable by giving a high-level description of a decider M with L(M) = L. L = {(A)|A is a DFA over 2* and L(A) = E* }arrow_forward
- pls anwser in prolog language, thank you.arrow_forwardCan you please help me with question 2.7 part B because I am struggling with this problem that I just don't understand. Can you please do a state diagram for the push down automaton for part B. question for 2.7 2.7 Give informal English descriptions of PDAs for the language. B. The complement of the language {a^n b^n | n ≥ 0}arrow_forwardFor each of the following languages LS {a, b}*, show that the elements of the infinite set {a"|n 2 0} are pairwise L-distinguishable. (a) L={a"ba²"|n 2 0}arrow_forward
- For each of the following languages Ls {a, b}*, show that the elements of the infinite set {a"|n > 0} are pairwise L-distinguishable. (b) L={a'b' a*\k > i+ j}arrow_forwardFor each of the following languages Ls {a, b}*, show that the elements of the infinite set {a"|n > 0} are pairwise L-distinguishable. (d) L= {a'b'\j is a multiple of i}arrow_forwardFor the language {a^n | n mod 2=1}, give are gular expression for this language 1 and give a context-free grammar that generates this language.arrow_forward
- Not handwritten Given the language L denoted by r = (a+b)* . (aa*+b) and, ∑ = {a,b} and ∏ = {c,d,x} h(b) = xd, h(a) = cdx please provide the homomorphic image of the regular expression h(r)arrow_forwardSuppose that relations R and S have n tuples and m tuples respectively. What is the minimum number of tuples that the results of the following expression can have? oc(R) × S, for some condition C. A. n*m B. min{n,m} С.n D. 0 E. m F. n-m G. n+m H. max{n,m}arrow_forwardConsider the language L of strings over the alphabet Σ = {a, b} which contain an equal number of a’s and b’s, and the set of b’s is consecutive in the string, e.g., ab, abba, aabb, abbbaa, aaabbbbbaa, etc. Note that ε ∈ L for completeness (0 number of a’s is equal to 0 number of b’s, which are also consecutive). Show that this language is context-free by giving a context-free grammar. Please make sure to test the answers onhttps://web.stanford.edu/class/archive/cs/cs103/cs103.1156/tools/cfg/arrow_forward
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