Western Governors Valid Algebraic Expressions & Computer Theories Exercises Define the set of valid algebraic expressions. Please check the attached files

Western Governors Valid Algebraic Expressions & Computer Theories Exercises Define the set of valid algebraic expressions. Please check the attached files for the question and answersThe file has the answer 9/23/2019
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Chapter 3, Problem 8P
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Introduction to Computer Theory (2nd Edition)
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De?ne the set of valid algebraic expressions ALEX as follows:
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Rule 1 All polynomials are in ALEX.
Rule 2 If f(x)and g(x) are in ALEX, then so are:
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(i) (f(x))
(ii) ?(f(x))
(iii) f(x) + g(x)
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(iv) f(x) – g(x)
(v) f(x)g(x)
(vi) f(x)/g(x)
(vii) f(g(x))
(viii) f(g(x))
a) Show that (x + 2)-3x is in ALEX.
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b) Show that elementary calculus contains enough rules to prove the theorem that all algebraic
expressions can be differentiated.
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c) Is Rule 2 (viii) really necessary?
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Consider the following rules:
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Rule 1: All polynomials are in ALEX.
Rule 2: If
and
are in ALEX, then so are:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
Comment
Step 2 of 4
(a)
Consider the following polynomial:
Assume,
and
• Both expressions
.
and
• From Rule 2,
are polynomials. By Rule 1,
is in the form of
and
, where
are in ALEX.
and
.
Comment
Step 3 of 4
(b)
The statement of the theorem is that “All algebraic expressions can be differentiated”.
Algebraic expressions are the expressions containing constants, variable, elementary arithmetic
operations, factorial, integer and rational exponent and nth roots.
Constants:
• The expression containing constants are the expressions containing only numbers.
• These are the expressions containing the terms without variables.
• The value of constant expression never changes.
Ex: 3, 4, 5, -2 etc.
Variables:
• The expression containing variables are the expressions containing symbol for representing a
number.
• The value of variable can be changed when required.
Ex:
etc.
Elementary arithmetic expressions:
• The mathematical expressions containing variables, numbers and operations are elementary
arithmetic expressions.
• The arithmetic expressions are addition, subtraction, multiplication and division.
Ex:
etc.
Factorial:
• The factorial of an integer is the product of integers less than or equal to it.
• The multiplication between two constant values is also a constant which can be represented in
an expression.
Ex:
etc.
Integer and rational exponents:
• The integer exponent of an expression is the product of the expression speci?ed by the integer
exponential value.
• The rational exponent of an expression is the product of the expression speci?ed by the
fractional exponential value.
Ex:
etc.
n th roots:
• The nth roots of an expression is the number that should be multiplied n times itself to equal a
given value.
Ex:
As the algebraic expression for elementary calculus satis?es the enough rules required for
differentiating the theorem is satis?ed.
Comment
Step 4 of 4
(c)
The rule
is not really necessary because, the expression is in the form of
with the value of input
is
. Here, the output of
is the input of
,
.
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