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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:An edge labeled with multiple symbols a, b,... → edge labeled with the symbol.
Select one:
O True
False
Given regular expressions R1 and R2, then....
Select one:
KEN
a. R1+R2 is a regular expression
b. R1R2 is a regular expression
c. R1 is a regular expression
d. All of the above
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- Alice, a friend of Mr. Bernard’s, wants to compose a song. She asks Mr. Bernard for help. Although Mr. Barnard knows nothing about music, he finds that the sequence of notes in a numbered musical notation can be expressed as an FSM with input the alphabet {1, 2, 3, 4, 5, 6, 7} (“do”, “re”, “mi”, “fa”, “so”, “la”, “ti”). Alice wants to compose a song that contains the pattern “15” an even number of times. Please draw an FSM that only accepts a sequence of notes that satisfies the above pattern. Note that you should provide a detailed description of the FSMs in your design to show how it works. Specifically, you should describe the meaning of each state.arrow_forwardFor diagrams with three arcs, there are 15 possibilities. considering the following set of arcs: arcs = [(0, 1), (0, 2), (1, 2)] This set of arcs should result in 1 crossing and 2 nestings. However, let's check the function's output: crossings, nestings = count_crossings_and_nestings(arcs)print(f"Number of crossings: {crossings}")print(f"Number of nestings: {nestings}") This outputs: Number of crossings: 0Number of nestings: 0 My questions I need help from you: The first problem is related to the variable n and its value. Explain what goes wrong. Provide a better implementation of the function, avoiding the use of n. Use the same function name, i.e., count_crossings_and_nestings.arrow_forwardPlot of the functions: f(x) = exp( −x/10) sin(πx) and g(x) = x exp(−x/3) over the interval [0, 10]. Include labels for the x- and y-axes, and a legend explaining which line is which plot. use phyton language import mathimport numpy as npimport matplotlib.pyplot as plt%matplotlib inlinearrow_forward
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- Nonearrow_forwardGiven a boolean expression consisting of the symbols 0 (false), 1 (true), & (AND), I (OR), and /\ (XOR), and a desired boolean result value result, implement a function to count the number of ways of parenthesizing the expression such that it evaluates to result. The expression should be fully parenthesized (e.g., ( 0) A( 1)) but not extraneously (e.g., ( ( ( 0)) /\ ( 1)) ). EXAMPLE countEval("l/\01011", false) -> 2 countEval("0&0&0&1All0", true)-> 10arrow_forward
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