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slippery slope
In logic and critical thinking, a slippery slope is a logical device in which a person asserts that some event must inevitably follow from another without any rational argument or demonstrable mechanism for the inevitability of the event in question. A slippery slope argument states that a relatively small first step leads to a chain of related events culminating in some significant effect, much like an object given a small push over the edge of a slope sliding all the way to the bottom. The strength of such an argument depends on the warrant, i.e. whether or not one can demonstrate a process that leads to the significant effect. This type of argument is sometimes used as a form of fear mongering, in which the probable consequences of a given action are exaggerated in an attempt to scare the audience. However, if an argument uses valid reasoning, it would not identify by the slippery-slope approach. The fallacious sense of "slippery slope" is often used synonymously with continuum fallacy, in that it ignores the possibility of middle ground and assumes a discrete transition from category A to category B. Modern usage avoids the fallacy by acknowledging the possibility of this middle ground.
== Description ==
The argument takes on one of various semantical forms:
* In the classical form, the arguer suggests that making a move in a particular direction starts something on a path down a "slippery slope". Having started down the metaphorical slope, it will continue to slide in the same direction (the arguer usually sees the direction as a negative direction).
* Modern usage includes a logically valid form, in which a minor action causes a significant impact through a long chain of logical relationships. Establishing this chain of logical implication (or quantifying the relevant probabilities) makes this form logically valid; the slippery slope argument remains a fallacy if such a chain is not established.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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