Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:Convert the following set of sentences to clausal form:
S1: A (B V E)
S2: E =D
S3: CAF= -B
S4: E = B
S5: B = F
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Transcribed Image Text:b. Use resolution to prove the following sentence from the clauses above.
¬A^¬B
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Transcribed Image Text:b. Use resolution to prove the following sentence from the clauses above.
¬A^¬B
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- The following is a context-free grammar G: V={A,B,S} S={a,b} v0=S S->A A a|b|A B A->B S a|a B->B a | epsilon Convert G into a CFG in Chomsky normal formarrow_forwardThe next 3 questions pertain to the following grammar from the book. The string to test is aba. S→ XY X→ XA | a | b Y→AY|a A→ a Question 1 Enter which variables can generate the following substrings of length 2 as found in stage 2 of the CYK algorithm. Enter no spaces. Enter multiple variables separated by a comma in alphabetical order (e.g., XY). If there are no variables that generate the substring, enter none. ab e ba e Question 2 Enter which variables can generate the following substrings of length 3 as found in stage 3 of the CYK algorithm. Enter no spaces. Enter multiple variables separated by a comma in alphabetical order (e.g., X,Y). If there are no variables that generate the substring, enter none. a ba e ab a +arrow_forwardHello I. Need help in theoretical computer science Subtask (a) Let G be a context-free grammar with the start variable S and the following rules, which describes a language using the alphabet Σ = {0, 1}. Show that almost all words in the language described by this grammar are 4-inflatable.arrow_forward
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