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Nature and Logic Essay

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Philosophy 103: Introduction to Logic
The Nature of Logic
Abstract: Some of the uses of logic are illustrated, and deductive arguments are briefly distinguished from inductive arguments.

I. Logic is the study of the methods and principles used in distinguishing correct from incorrect reasoning.
B. Logic differs from psychology in being a normative or a prescriptive discipline rather than a descriptive discipline.
1. I.e., it prescribes how one ought to reason; it's not concerned with how one actually does reason.
2. Logic is concerned with laying down the rules for correct reasoning.
3. Consequently, logic seeks to distinguish good arguments from poor ones.
II. How Logic helps reasoning:
A. "Practice makes better." Some examples of how this course can help reasoning about the world are as follows.
1. Consider this syllogism:
All followers of Senator Jones are in favor of higher taxes.
All communists are in favor of higher taxes.
All followers of Senator Jones are communists.
It will become easy for us to recognize the fallacy in this argument as the fallacy of the undistributed middle term.
2. Consider this informal argument:
In spite of the large number of UFO spottings that can be attributed to weather conditions and known aircraft and other factors, there are hundreds of sightings that cannot be accounted for. Hence, we can safely conclude that UFO's exit.
Consider this counter-example:
In spite of the large number of quarters put under kid's pillows which can be attributed to sneaky parents, brothers, sisters, and so forth, there are hundreds of cases which cannot be accounted for. Therefore, the tooth fairy exits.
B. As well, this course can help with "the negative approach"—that we avoid errors by being aware of them, e.g., being aware of common formal and informal fallacies.
1. Consider the passage, "Napoleon became a great emperor because he was so short." In this short argument, the fallacy of false cause (or non causa pro causa) occurs. If this argument were good, all or most short persons would become great emperors.
2. Consider the passage, "People in developing countries get old as an earlier age, because the average life expectancy is so short in those countries." Due to infant mortality, people do not get older more quickly; the fallacy of division occurs.
C. Methods, criteria, and t...


... middle of paper ...


...t bottom I did not believe I had touched that man. The law of probabilities decreed me guiltless of his blood, for in all my small experience with guns I had never hit anything I had tried to hit and I knew I had done my best to hit him."
3. Or consider extrapolation techniques used in stock market prediction, e.g., the wedge formation.
V. What logic is not:
A. Logic is not the science of the laws of thought--in which case it would be a descriptive science like psychology.
1. Sometimes people can come to conclusions reliably without being able to know or explain how the conclusion was reached. E.g., the so-called intuitive type of personality.
2. Often people can come to the right conclusion for the wrong reasons. Logic is the study of the modes of correct reasoning as shown in an interpersonal manner.
B. Logic is not really the science of reasoning either because the logician is not interested in the psychological processes of reasoning.
1. The logician is interested in the structure of arguments.
2. People infer statements and statements entail other statements.
3. We want to say that the entailment is there even though someone does not at this time understand it.


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