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In law, rebuttal is a form of evidence that is presented to contradict or nullify other evidence that has been presented by an adverse party. By analogy the same term is used in politics and public affairs to refer to the informal process by which statements, designed to refute or negate specific arguments (see Counterclaim) put forward by opponents, are deployed in the media.
The typical straw man argument creates the illusion of having refuted or defeated an opponent's proposition through the covert replacement of it with a different proposition (i.e., "stand up a straw man") and the subsequent refutation of that false argument ("knock down a straw man"), instead of the opponent's proposition.
In the first example argument map, the objector can't find anything contentious in the stated premises of the argument, but still disagrees with the conclusion; the objection is therefore placed beside the main premise and, in this case, exactly corresponds to an unstated or 'hidden' co-premise. This is demonstrated by the second example ...
A counterargument can be issued against an argument retroactively from the point of reference of that argument. This form of counterargument — invented by the presocratic philosopher Parmenides – is commonly referred to as a retroactive refutation. [3]
Traditionally, rebuttals were half the length of constructive speeches, 8–4 min in high school and 10–5 min in college. The now-prevailing speech time of 8–5 min in high school and 9-5 in college was introduced in the 1990s. Some states, such as Missouri, Massachusetts and Colorado, still use the 8–4 min format at the high school level.
An example is a probabilistically valid instance of the formally invalid argument form of denying the antecedent or affirming the consequent. [ 12 ] Thus, "fallacious arguments usually have the deceptive appearance of being good arguments, [ 13 ] because for most fallacious instances of an argument form, a similar but non-fallacious instance ...
For example, if A. Plato was mortal, and B. Socrates was like Plato in other respects, then asserting that C. Socrates was mortal is an example of argument by analogy because the reasoning employed in it proceeds from a particular truth in a premise (Plato was mortal) to a similar particular truth in the conclusion, namely that Socrates was mortal.
In modern usage, it has come to refer to an argument in which the premises assume the conclusion without supporting it. This makes it an example of circular reasoning. [1] [2] Some examples are: "People have known for thousands of years that the earth is round. Therefore, the earth is round." "Drugs are illegal so they must be bad for you.