Let G=(V,Σ,R,S) be the following grammar. - V={S,T,U} - Σ={0,#} - R is the set of rules: - S→TT∣U - T→0T∣T0∣# .U →0U001# Show that: 1. Describe L(G) in English. 2. Prove that L(G) is not regular

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Answer 1

1. L(G) describes the language consisting of strings that can be generated by the given grammar G. In English, the language L(G) can be described as follows:

  - The language contains strings that consist of a sequence of T's and U's.

  - Each T can be replaced by either "0T", "T0", or "#".

  - U can be replaced by "0U001#".

2. To prove that L(G) is not regular, we can use the Pumping Lemma for regular languages. The Pumping Lemma states that for any regular language L, there exists a pumping length p such that any string s ∈ L with |s| ≥ p can be divided into five parts: s = xyzuv, satisfying the following conditions:

  1. |yuv| > 0

  2. |yv| ≤ p

  3. For all n ≥ 0, xy^nzu^nv ∈ L.

Let's assume that L(G) is a regular language. According to the Pumping Lemma, there exists a pumping length p such that any string s ∈ L(G) with |s| ≥ p can be divided into five parts: s = xyzuv.

Consider the string w = T^p U 0^p 0^p 0^p 1# ∈ L(G), where T^p represents p consecutive T's and 0^p represents p consecutive 0's.

By choosing the division as follows: x = ε, y = T^p, z = ε, u = ε, v = ε, we can observe that |yv| ≤ p and |xyzuv| = p + p = 2p.

Now, let's consider the pumped string w' = xy^2zuv^2 = T^p T^p U 0^p 0^p 0^p 1#.

Since the language L(G) requires the number of 0's after U to be the same as the number of T's, the pumped string w' will have an unequal number of 0's after U and T's, violating the rules of the grammar G.

Therefore, we have found a string w' that does not belong to L(G) after pumping, contradicting the assumption that L(G) is a regular language.

Hence, we can conclude that L(G) is not a regular language.

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Related Questions

Develop a minimum-multiplier realization of a length-7 Type 3 Linear Phase FIR Filter.

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A minimum-multiplier realization of a length-7 Type 3 Linear Phase FIR Filter can be developed.

To develop a minimum-multiplier realization of a length-7 Type 3 Linear Phase FIR Filter, we need to understand the key components and design considerations involved. A Type 3 Linear Phase FIR Filter is characterized by its linear phase response, which means that all frequency components of the input signal experience the same constant delay. The minimum-multiplier realization aims to minimize the number of multipliers required in the filter implementation, leading to a more efficient design.

In this case, we have a length-7 filter, which implies that the filter has 7 taps or coefficients. Each tap represents a specific weight or gain applied to a delayed version of the input signal. To achieve a minimum-multiplier realization, we can exploit the symmetry properties of the filter coefficients.

By carefully analyzing the symmetry properties, we can design a structure that reduces the number of required multipliers. For a length-7 Type 3 Linear Phase FIR Filter, the minimum-multiplier realization can be achieved by utilizing symmetric and anti-symmetric coefficients. The symmetric coefficients have the same value at equal distances from the center tap, while the anti-symmetric coefficients have opposite values at equal distances from the center tap.

By taking advantage of these symmetries, we can effectively reduce the number of multipliers needed to implement the filter. This results in a more efficient and resource-friendly design.

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A cylinder with a movable piston contains 5.00 liters of a gas at 30°C and 5.00 bar. The piston is slowly moved to compress the gas to 8.80bar. (a) Considering the system to be the gas in the cylinder and neglecting ΔEp, write and simplify the closed-system energy balance. Do not assume that the process is isothermal in this part. (b) Suppose now that the process is carried out isothermally, and the compression work done on the gas equals 7.65L bar. If the gas is ideal so that ^ U is a function only of T, how much heat (in joules) is transferred to or from (state which) thes urroundings? (Use the gas-constant table in the back of the book to determine the factor needed to convert Lbar to joules.)(c) Suppose instead that the process is adiabatic and that ^ U increases as T increases. Is the nal system temperature greater than, equal to, or less than 30°C? (Briey state your reasoning.)

Answers

A cylinder with a movable piston contains 5.00 liters of a gas at 30°C and 5.00 bar. The piston is slowly moved to compress the gas to 8.80bar.

(a) The closed-system energy balance can be written as follows:ΔU = Q − W, where ΔU is the change in internal energy, Q is the heat transferred to the system, and W is the work done by the system. Neglecting ΔEp, the work done by the system is given by W = PΔV, where P is the pressure and ΔV is the change in volume. Therefore, ΔU = Q − PΔV.

(b) Since the process is carried out isothermally, the temperature remains constant at 30°C. Therefore, ΔU = 0. The work done by the system is

W = −7.65 L bar, since the compression work is done on the gas. Using the gas constant table, we find that 1 L bar = 100 J. Therefore, the work done by the system is

W = −7.65 L bar × 100 J/L bar = −765 J. Since

ΔU = 0, we have Q = W = −765 J. The heat is transferred from the system to the surroundings.

(c) Since the process is adiabatic, Q = 0. Therefore, the closed-system energy balance simplifies to ΔU = −W. Since the gas is ideal and ^ U is a function only of T, the change in internal energy can be written as ΔU = (3/2)nRΔT, where n is the number of moles of gas, R is the gas constant, and ΔT is the change in temperature. Since ^ U increases as T increases, we have ΔU > 0. Therefore, ΔT > 0, and the final system temperature is greater than 30°C.

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QUESTION 1 Which of the followings is true? Narrowband FM is considered to be identical to AM except O A. their bandwidth. O B. a finite and likely large phase deviation. O C. an infinite phase deviation. O D. a finite and likely small phase deviation.

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Narrowband FM is considered to be identical to AM except in their bandwidth. In narrowband FM, a finite and likely small phase deviation is present. It is the modulation method in which the frequency of the carrier wave is varied slightly to transmit the information signal.

Narrowband FM is an FM transmission method with a smaller bandwidth than wideband FM, which is a more common approach. Narrowband FM is quite similar to AM, but the key difference lies in the modulation of the carrier wave's amplitude in AM and the modulation of the carrier wave's frequency in Narrowband FM.

The carrier signal in Narrowband FM is modulated by a small frequency deviation, which is inversely proportional to the carrier frequency and directly proportional to the modulation frequency. Therefore, Narrowband FM is identical to AM in every respect except the bandwidth of the modulating signal.

When the modulating signal is a simple sine wave, the carrier wave frequency deviates up and down about its unmodulated frequency. The deviation of the frequency is proportional to the amplitude of the modulating signal, which produces sidebands whose frequency is equal to the carrier frequency plus or minus the modulating signal frequency. 

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Prove that a Schmitt oscillator trigger can work as a VCO.

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Step 1:

A Schmitt oscillator trigger can work as a VCO (Voltage Controlled Oscillator).

Step 2:

A Schmitt oscillator trigger, also known as a Schmitt trigger, is a circuit that converts an input signal with varying voltage levels into a digital output with well-defined high and low voltage levels. It is commonly used for signal conditioning and noise filtering purposes. On the other hand, a Voltage Controlled Oscillator (VCO) is a circuit that generates an output signal with a frequency that is directly proportional to the input voltage applied to it.

By incorporating a voltage control mechanism into the Schmitt trigger circuit, it can be transformed into a VCO. This can be achieved by introducing a variable voltage input to the reference voltage level of the Schmitt trigger. As the input voltage changes, it will cause the switching thresholds of the Schmitt trigger to vary, resulting in a change in the output frequency.

The VCO functionality of the modified Schmitt trigger circuit allows it to generate a continuous output signal with a frequency that can be controlled by the applied voltage. This makes it suitable for various applications such as frequency modulation, clock generation, and signal synthesis.

Step 3:

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