Fallacies
Ambiguity Fallacies
AMPHIBOLY: A fallacy of syntactical ambiguity deliberately misusing implications. Example: "Three out of four doctors recommend this type of pain relief!" The implied asrtion here is that three out of four means venty-five percent of all doctors and that this type of pain relief means this particular pain reliever.
EQUIVOCA TION: This fallacy is a product of mantic ambiguity. The arguer us the ambiguous nature of a word or phra to shift the meaning in such a way as to make the reason offered appear more convincing. Example: An ad from a sugar company says "Sugar is an esntial component of the body, a key material in all sorts of metabolic process, so buy some P&R sugar today." The word "sugar" is being ud with two definitions that the ad does not acknowledge.
Appeals to Motive in Place of Support Fallacies
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APPEAL TO EMOTION: In this fallacy, the arguer us emotional appeals rather than logical reasons to persuade the listener. The fallacy can appeal to various emotions including pride, pity, fear, hate, van
ity, or sympathy. The appeal to sympathy is actually a formal fallacy labeled Ad Miricordiam. Generally, the issue is oversimplified to the advantage of the arguer. Example: In 1972, there was a widely printed advertiment printed by the Foulke Fur Co., which was in reaction to the frequent protests against the killing of Alaskan als for the making of fancy furs. According to the advertiment, clubbing the als was one of the great conrvation stories of our history, a mere exerci in wildlife management, becau "biologists believe a healthier colony is a controlled colony."
COMMON BELIEF: This fallacy is committed when we asrt a statement to be true on the evidence that many other people allegedly believe it. Being widely believed is not proof or evidence of the truth. Example: Of cour Nixon was guilty in Watergate. Everybody knows that. PAST BELIEF: A form of the COMMON BELIEF fallacy. The same error in reasoning is committed except the claim is for belief or support in the past. Example: Everyone knows that the Earth is flat, so why do you persist in your outlandish claims?
SLANTING: A form of misreprentation in which a true statement is made, but made in such a way as to suggest that something is not true or to give a fal description through the manipulation of connotation. Example: I can't believe how much money is being poured into the space program (sug
gesting that 'poured' means heedless and unnecessary spending).
Category Fallacies
COMPOSITION: Becau the parts of a whole have a certain property, it is argued
that the whole has that property. That whole may be either an object compod of different parts, or it may be a collection or t of individual members. Example: The brick wall is six feet tall. Thus, the bricks in the wall are six feet tall. or Conventional bombs did more damage in W.W. II than nuclear bombs. Thus, a conventional bomb is more dangerous than a nuclear bomb. DIVISION: This fallacy is committed when we conclude that any part of a particular whole must have a characteristic becau the whole has that characteristic. Example: I am sure that Karen plays the piano well, since her family is so musical. Causal Fallacies
GENUINE BUT INSIGNIFICANT CAUSE: The object or event identified as the cau of an effect is a genuine cau, but insignificant when compared to the other caus of that event. Example: Smoking is causing air pollution in our cities. (True, but the effect of smoking is insignificant compared to the effect
of auto exhaust.) or By leaving your air conditioner on overnight you are contributing to global warming.
POST HOC ERGO PROPTER HOC: A form of a hasty generalization in which it is inferred that becau one event followed another it is necessarily caud by that event. Example: Mary joined our class and the next week we all did poorly on the quiz. It must be her fault.
两会翻译Changing the Subject Fallacies
A TTACKING THE PERSON or Ad Hominum. Attacking the arguer rather than his/her argument. Saying something negative about someone is not automatically ad hominum. If a person (politician for example) is the issue, then it is not a fallacy. Example: John's objections to capital punishment carry no weight since he is a convicted felon.
APPEAL TO AUTHORITY or Ad verecuniam. This fallacy tries to convince the listener by appealing to an expert. Often times it is an authority in one field who is speaking out of his field. Example: Sports stars lling cars or hamburgers. Or, the actor on a TV commercial that says, "I'm not a doctor, but I play one on TV."
Definition Fallacies
BEGGING THE QUESTION: An argument in which the conclusion is implied or already assumed in the premis. Also said to be a circular argument. Example: Of cour the Bible is the word of God. Why? Becau God says so in the Bible. CIRCULAR DEFINITION: The definition includes the term being defined as a part of the definition. Example: An animal is human if and only if it has human parents. (The term being defined is "human". But in order to find a human, we would need to find human parents. To find human parents we would already need to know what a human is.) or A book is pornographic if and only if it contains pornography. (We would need to know what pornography is in order to tell whether a book is pornographic.)
Distraction Fallacies
APPEAL TO IGNORANCE or Ad ignorantium. Arguing on the basis of what is known and can be proven. If you can't prove that something is true then it must be fal (and vice versa). Example: Y ou can't prove there isn't a Loch Ness Monster, so there must be one.
FALSE DILEMMA(often called the either/or fallacy becau the argument nearly always includes the words " or..."). This fallacy assumes that we must choo between two opposite extremes instead of allowing for other possibilities, especially for the possibility of choosing an alternative betw
een the extremes. Example: Women need to be either brilliant or beautiful to survive in this world.
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SLIPPERY SLOPE or : A line of reasoning in which there is no gray area or middle ground. It states that x, y, z are implicit in step a. The primary characteristic is that it fails to distinguish between (or among) degrees of difference. It argues for (or against) the first step becau if you
take the first step, you will inevitably follow through to the last. Example: We can't allow students any voice in decision-making on campus; if we do, it won't be long before they are in total control.
Explanation Fallacies
QUESTIONABLE CAUSE. The fallacy of questionable cau is committed when, on insufficient evidence, we identify a cau for an occurrence that has taken place or a fact that is true. Example: I can't find the checkbook; I am sure that my husband hid it so I couldn't go shopping today. UNTESTABILITY: The theory advanced to explain why some phenomena occurs cannot be tested. We test a theory by means of its predictions. For example, a theory may predict that light bends under certain conditions, or that a liquid will change color if sprayed with acid, or that a psychotic person will respond badly to particular stimuli. If the predicted event fails to occur, then this is evidence against the theory.
A theory cannot be tested when it makes no predictions. It is also untestable when it predicts events which would occur whether or not the theory were true. Example: Aircraft in the mid-Atlantic disappear becau of the effect of the Bermuda Triangle, a force so subtle it cannot be measured on any instrument. (The force of the Bermuda Triangle has no effect other than the occasional downing of aircraft. The only possible prediction is that more aircraft will be lost. But this is likely to happen whether or not the theory is true.)
Inductive Fallac ies
ARGUMENT FROM ANALOGY or FALSE ANALOGY: An unsound form of inductive argument in which an argument is bad completely or relies heavily on analogy to prove its point. Example: This must be a great car, for, like the finest watches in the world, it was made in Switzerland.
FAR-FETCHED HYPOTHESIS: A fallacy of inductive reasoning that is committed when we accept a particular hypothesis when a more acceptable hypothesis, or one more strongly bad in fact, is available. Example: The African-American church was t afire after the civil rights meeting last night; therefore, it must have been done by the leader and the minister to cast suspicion on the local gregationists.赋闲
HASTY GENERALIZA TION: A generalization accepted on the support of a sample that is too small or biad to warrant it. Example: All men are rats! Just look at the lou that I married.
Missing the Point Fallacies
CONTRARY TO FACT HYPOTHESIS: This fallacy is committed when we state with an unreasonable degree of certainty the results of an event that might have occurred but did not. Example: If President Bush had not gone into the Persian Gulf with military force when he did, Saddam Husin would control the world's oil from Saudi Arabia today.parent
RED HERRING: This fallacy introduces an irrelevant issue into a discussion as a diversionary tactic. It takes people off the issue at hand; it is beside the point. Example: Many people say that engineers need more practice in writing, but I would like
to remind them how difficult it is to master all the math and drawing skills that an engineer requires.
STRA W MAN: This fallacy occurs when we misreprent an opponent's position to make it easier to attack, usually by distorting his or her views to ridiculous extremes. This can also take the form of attacking only the weak premis in an opposing argument while ignoring the strong ones.
Example: Tho who favor gun-control legislation just want to take all guns away from responsible citizens and put them into the hands of the criminals.
TWO WRONGS MAKE A RIGHT: This fallacy is committed when we try to justify an apparently wrong action by charges of a similar wrong. The underlying assumption is that if they do it, then we can do it too and are somehow justified. Example: Supporters of apartheid are often guilty of this error in reasoning. They point to U.S. practices of slavery to justify their system.
Non Sequitur Fallacies
AFFIRMING THE CONSEQUENT: An invalid form of the conditional argument in which the cond premi affirms the conquent of the first premi and the conclusion affirms the antecedent. Example: If he wants to keep the job, then he will work hard. He is working hard; therefore he wants to keep the job.
DENYING THE ANTECEDENT: An invalid form of the conditional argument in which the cond premi denies the antecedent of the first premi, and the conclusion denies the conquent. Example: If he wants to keep his job, he will work hard. He does not want that job, so he won't work hard.
INCONSISTENCY: A discour is inconsistent or lf-contradicting if it contains, explicitly or implicitly, two asrtions that are logically incompatible with each other. Inconsistency can also occur between words and actions. Example: A woman who demands equal rights and reprents herlf as a feminist, yet is upt when a date expects her to pay half.
NON SEQUITUR: In this fallacy the premis have no direct relationship to the conclusion. This fallacy appears in political speeches and advertising with great frequency. Example: A waterfall in the background and a beautiful girl in the foreground have nothing to do with an automobile's performance.
Statistical Syllogism Fallacies
ACCIDENT: A general rule is applied when circumstances suggest that an exception to the rule should apply. Example: The law says that you should not travel faster than 50 mph, thus even though your father could not breathe, you
should not have traveled faster than 50 mph
CONVERSE ACCIDENT: An exception to a generalization is applied to cas where the generalizatigodspeed
on should apply. Example: Becau we allow terminally ill patients to u heroin, we should allow everyone to u heroin.
Syllogism Error Fallacies
FALLACY OF EXCLUSION: Important evidence which would undermine an inductive argument is excluded from consideration. The requirement that all relevant information be included is called the "principle of total evidence." Example: Edward is a Floridian, and most Floridians vote Republican, so Edwards
will probably vote Republican. (The information left out is that Edwards lives in Miami, and that most people in Miami vote Democrat.)
FALLACY OF DRA WING AN AFFIRMA TIVE CONCLUSION FROM A NEGA TIVE PREMISE: The conclusion of a standard form categorical syllogism is affirmative, but at least one of the premis is negative. Examples: All mice are animals, and some animals are not dangerous,
therefore some
bbkxw netmice are dangerous. or No honest people steal, and all honest people pay taxes, so some people w
ho steal pay pay taxes.
ILLICIT MAJOR: The predicate term of the conclusion refers to all members of that category, but the same term in the premis refers only to some members of that category. Example: All Texans are Americans, and no Californians are Texans, therefore, no Californians are Americans.
A
Ad hominem
Appeal to probabilityopinion
Appeal to ridicule
Appeal to traditionbrittle
Argument from tting a precedent Argumentum ad baculum Argumentum ad populum
B
Bare asrtion fallacy
Begging the question
Burden of proof (logical fallacy)
C
Conditional probability Confusion of the inver Conjunction fallacy
Continuum fallacy
Correlative-bad fallacies
D
Deductive fallacy
Definist fallacy
Denying the correlative
Double counting (fallacy)
E
Ecological fallacy Etymological fallacy
F
Fallacy
Fallacy of distribution
F cont.
Fallacy of misplaced concreteness Fallacy of quoting out of context Fal attribution
Fal dilemma
Fal premi
G
Greedy reductionism
H
Historian's fallacy
Historical fallacy
Homunculus argument
Hoyle's fallacy
I
If-by-whiskey
Incomplete comparison
Inconsistent comparison
Infinite regress
Informal fallacy
Invalid proof
J
Judgmental language
L
Loaded question
Ludic fallacy
M
Masked man fallacy
Meaningless statement
Moving the goalpost
N
Negative proof
Nirvana fallacy
No true Scotsman
N cont.percent
Non quitur (logic)
P
Package-deal fallacy
Parade of horribles
Pathetic fallacy
Perfect solution fallacy
Poisoning the well
Post disputation argument
Prentism (literary and historical analysis) Pro hominem Proof by asrtion
