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It may be the case that several sufficient conditions, when taken together, constitute a single necessary condition (i.e., individually sufficient and jointly necessary), as illustrated in example 5. Example 1 "John is a king" implies that John is male. So knowing that John is a king is sufficient to knowing that he is a male. Example 2
Necessary condition analysis (NCA) is a research approach and tool employed to discern "necessary conditions" within datasets. [1] These indispensable conditions stand as pivotal determinants of particular outcomes, wherein the absence of such conditions ensures the absence of the intended result.
In this case, c) has unwarranted necessity by assuming, incorrectly, that John cannot stop being a bachelor. Formally speaking, this type of argument equivocates between the de dicto necessity of a) and the de re necessity of c). The argument is only valid if both a) and c) are construed de re.
In biological research, experiments or tests are often used to study predicted causal relationships between two phenomena. [1] These causal relationships may be described in terms of the logical concepts of necessity and sufficiency. Consider the statement that a phenomenon x causes a phenomenon y.
[2]: 649 For example, the utterance in (4) expresses that, according to what the speaker has observed, it is necessary to conclude that John has a rather high income: (4) John must be earning a lot of money. The modal base here is the knowledge of the speaker, the modal force is necessity.
A common example in everyday life might be the following: Mickey Mouse is the President of the United States. The President is at least 35 years old. Thus, Mickey Mouse is necessarily 35 years or older. Why is this false? The conclusion is false, since, even though Mickey Mouse is over 35 years old, there is no logical necessity for him to be.
Opinio juris sive necessitatis ("an opinion of law or necessity") also simply opinio juris ("an opinion of law") is the belief that an action was carried out as a legal obligation. This is in contrast to an action resulting from cognitive reaction or behaviors habitual to an individual.
Metaphysical necessity is contrasted with other types of necessity. For example, the philosophers of religion John Hick [2] and William L. Rowe [3] distinguished the following three: factual necessity (existential necessity): a factually necessary being is not causally dependent on any other being, while any other being is causally dependent on it.