exercises 11-12, use all the premises to determine the valid conclusion for the given argument. 1. If it is a theropod, then it is not herbivorous. If it is not herbivorous, then it is not sauropod. It is a sauropod. Therefore, 2. If you buy the car, you will need a loan. You do not need a loan or you will make a monthly payments. You buy the car. Therefore, Important note: please make solutions TYPEWRITTEN

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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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In exercises 11-12, use all the premises to determine the valid conclusion for the given argument. 1. If it is a theropod, then it is not herbivorous. If it is not herbivorous, then it is not sauropod. It is a sauropod. Therefore, 2. If you buy the car, you will need a loan. You do not need a loan or you will make a monthly payments. You buy the car. Therefore, Important note: please make solutions TYPEWRITTEN and NOT HANDWRITTEN Use the given lesson attached as reference
Example 4.4
Determine whether the argument is valid or invalid.
1. If I had a cold, then I find it difficult to sleep.
I find it difficult to sleep.
Therefore, I have a cold.
Solution: This matches the form known as fallacy of the converse. Thus, this is an invalid
argument. Having a cold is not the only cause of sleeping difficulty. It may be caused by some
other factors.
Further, we may consider an argument with the following symbolic form.
q-r
Premise 1
r-s
Premise 2
-t-s
Premise 3
Premise 4
9
To determine whether the argument is valid or invalid using truth table would require a
table with 2* = 16 rows. It would be time consuming to construct such table and with the large
number of truth values to be determined, we might make an error. Thus we consider a different
approach that makes use of a sequence of valid arguments to arrive at a conclusion.
Consider the above example.
Premise 1
Premise 2
Transitive Reasoning
q→r
ris
:.q-s
q-s
s t
9-t
q-t
9
at
The sequence of a valid arguments shows that is a valid conclusion for the original
argument. Thus the original argument is a valid argument.
Example 4.4
Determine whether the following arguments are valid.
1. If the movie was directed by Steven Spielberg (s), then I want to see it (w). The movie's
production costs must exceed 50 million dollars (c) or I do not want to see it. The movie's
production costs were less than 50 million dollars. Therefore, the movie was not directed by
Steven Spielrberg.
Solution:
S-W
CV-W
Previous Conclusion
Premise 3
Transitive Reasoning
Transforming the argument to its symbolic form yields
Premise 1
Premise 2
Premise 3
Conclusion
. ~S
Previous Conclusion
Premise 4
Direct Reasoning
S W
WIC
Premise 2 can be written as w→ cas previously discussed. Applying transitive reasoning and
this equivalent form of Premise 2 produces
SIC
Premise 1
Premise 2
Transitive Reasoning
Transcribed Image Text:Example 4.4 Determine whether the argument is valid or invalid. 1. If I had a cold, then I find it difficult to sleep. I find it difficult to sleep. Therefore, I have a cold. Solution: This matches the form known as fallacy of the converse. Thus, this is an invalid argument. Having a cold is not the only cause of sleeping difficulty. It may be caused by some other factors. Further, we may consider an argument with the following symbolic form. q-r Premise 1 r-s Premise 2 -t-s Premise 3 Premise 4 9 To determine whether the argument is valid or invalid using truth table would require a table with 2* = 16 rows. It would be time consuming to construct such table and with the large number of truth values to be determined, we might make an error. Thus we consider a different approach that makes use of a sequence of valid arguments to arrive at a conclusion. Consider the above example. Premise 1 Premise 2 Transitive Reasoning q→r ris :.q-s q-s s t 9-t q-t 9 at The sequence of a valid arguments shows that is a valid conclusion for the original argument. Thus the original argument is a valid argument. Example 4.4 Determine whether the following arguments are valid. 1. If the movie was directed by Steven Spielberg (s), then I want to see it (w). The movie's production costs must exceed 50 million dollars (c) or I do not want to see it. The movie's production costs were less than 50 million dollars. Therefore, the movie was not directed by Steven Spielrberg. Solution: S-W CV-W Previous Conclusion Premise 3 Transitive Reasoning Transforming the argument to its symbolic form yields Premise 1 Premise 2 Premise 3 Conclusion . ~S Previous Conclusion Premise 4 Direct Reasoning S W WIC Premise 2 can be written as w→ cas previously discussed. Applying transitive reasoning and this equivalent form of Premise 2 produces SIC Premise 1 Premise 2 Transitive Reasoning
Combining the conclusion s→c with Premise 3 gives us
Previous Conclusion
Premise 3
Contrapositive Reasoning
SIC
~C
:~S
The sequence has produced the desired conclusion. Thus, the original argument is valid.
2. I start to fall asleep (a) if I read a Math book (m). I drink soda (s) whenever I start to fall
asleep. If I drink soda then I must eat candy bar (c). Therefore, I eat candy bar whenever I read
a Math book.
Solution:
Transforming the argument in its symbolic form yields
m-a
a s
SIC
:m-c
Combining Premise 1 and Premise 2 results to
Premise 1
Premise 2
Transitive Reasoning
Next we combine the previous conclusion with Premise 3
m-a
a s
m-s
Premise 1
Premise 2
Premise 3
Conclusion
m-s
SIC
:m-c
Previous Conclusion
Premise 3
Transitive Reasoning
We have shown that the process resulted to desired conclusion, mc, hence, the argument is
valid.
Transcribed Image Text:Combining the conclusion s→c with Premise 3 gives us Previous Conclusion Premise 3 Contrapositive Reasoning SIC ~C :~S The sequence has produced the desired conclusion. Thus, the original argument is valid. 2. I start to fall asleep (a) if I read a Math book (m). I drink soda (s) whenever I start to fall asleep. If I drink soda then I must eat candy bar (c). Therefore, I eat candy bar whenever I read a Math book. Solution: Transforming the argument in its symbolic form yields m-a a s SIC :m-c Combining Premise 1 and Premise 2 results to Premise 1 Premise 2 Transitive Reasoning Next we combine the previous conclusion with Premise 3 m-a a s m-s Premise 1 Premise 2 Premise 3 Conclusion m-s SIC :m-c Previous Conclusion Premise 3 Transitive Reasoning We have shown that the process resulted to desired conclusion, mc, hence, the argument is valid.
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